394631 has 2 divisors, whose sum is σ = 394632. Its totient is φ = 394630.

The previous prime is 394619. The next prime is 394633. The reversal of 394631 is 136493.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-394631 is a prime.

It is a super-2 number, since 2×394631² = 311467252322, which contains 22 as substring.

Together with 394633, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 394631.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (394633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197315 + 197316.

It is an arithmetic number, because the mean of its divisors is an integer number (197316).

2³⁹⁴⁶³¹ is an apocalyptic number.

394631 is a deficient number, since it is larger than the sum of its proper divisors (1).

394631 is an equidigital number, since it uses as much as digits as its factorization.

394631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1944, while the sum is 26.

The square root of 394631 is about 628.1966252695. The cubic root of 394631 is about 73.3494845050.

The spelling of 394631 in words is "three hundred ninety-four thousand, six hundred thirty-one".