394931 has 2 divisors, whose sum is σ = 394932. Its totient is φ = 394930.

The previous prime is 394897. The next prime is 394943. The reversal of 394931 is 139493.

It is a strong prime.

It is an emirp because it is prime and its reverse (139493) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-394931 is a prime.

It is a super-2 number, since 2×394931² = 311940989522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 394894 and 394903.

It is not a weakly prime, because it can be changed into another prime (394981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197465 + 197466.

It is an arithmetic number, because the mean of its divisors is an integer number (197466).

2³⁹⁴⁹³¹ is an apocalyptic number.

394931 is a deficient number, since it is larger than the sum of its proper divisors (1).

394931 is an equidigital number, since it uses as much as digits as its factorization.

394931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2916, while the sum is 29.

The square root of 394931 is about 628.4353586488. The cubic root of 394931 is about 73.3680666502.

The spelling of 394931 in words is "three hundred ninety-four thousand, nine hundred thirty-one".