394 has 4 divisors (see below), whose sum is σ = 594. Its totient is φ = 196.

The previous prime is 389. The next prime is 397. The reversal of 394 is 493.

394 = T_{12} + T_{13} + ... +
T_{15}.

394 is nontrivially palindromic in base 14.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 493 = 17 ⋅29.

It can be written as a sum of positive squares in only one way, i.e., 225 + 169 = 15^2 + 13^2 .

It is a magnanimous number.

394 is an undulating number in base 14.

It is a plaindrome in base 9, base 12, base 13 and base 16.

It is not an unprimeable number, because it can be changed into a prime (397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97 + ... + 100.

2^{394} is an apocalyptic number.

394 is a deficient number, since it is larger than the sum of its proper divisors (200).

394 is a wasteful number, since it uses less digits than its factorization.

394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199.

The product of its digits is 108, while the sum is 16.

The square root of 394 is about 19.8494332413. The cubic root of 394 is about 7.3310369302.

Subtracting from 394 its sum of digits (16), we obtain a triangular number (378 = T_{27}).

Subtracting 394 from its reverse (493), we obtain a palindrome (99).

It can be divided in two parts, 3 and 94, that multiplied together give a palindrome (282).

The spelling of 394 in words is "three hundred ninety-four", and thus it is an aban number.

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