394662631 has 4 divisors (see below), whose sum is σ = 430541064. Its totient is φ = 358784200.

The previous prime is 394662617. The next prime is 394662637. The reversal of 394662631 is 136266493.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 394662631 - 2¹⁷ = 394531559 is a prime.

It is a super-2 number, since 2×394662631² = 311517184615684322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394662637) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17939200 + ... + 17939221.

It is an arithmetic number, because the mean of its divisors is an integer number (107635266).

Almost surely, 2^394662631 is an apocalyptic number.

394662631 is a deficient number, since it is larger than the sum of its proper divisors (35878433).

394662631 is a wasteful number, since it uses less digits than its factorization.

394662631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35878432.

The product of its digits is 139968, while the sum is 40.

The square root of 394662631 is about 19866.1176629960. The cubic root of 394662631 is about 733.5144418848.

The spelling of 394662631 in words is "three hundred ninety-four million, six hundred sixty-two thousand, six hundred thirty-one".