396631 has 2 divisors, whose sum is σ = 396632. Its totient is φ = 396630.

The previous prime is 396629. The next prime is 396637. The reversal of 396631 is 136693.

It is a weak prime.

It is an emirp because it is prime and its reverse (136693) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 396631 - 2¹ = 396629 is a prime.

It is a super-2 number, since 2×396631² = 314632300322, which contains 22 as substring.

Together with 396629, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 396631.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (396637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198315 + 198316.

It is an arithmetic number, because the mean of its divisors is an integer number (198316).

2³⁹⁶⁶³¹ is an apocalyptic number.

396631 is a deficient number, since it is larger than the sum of its proper divisors (1).

396631 is an equidigital number, since it uses as much as digits as its factorization.

396631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2916, while the sum is 28.

The square root of 396631 is about 629.7864717505. The cubic root of 396631 is about 73.4731881165.

It can be divided in two parts, 39 and 6631, that added together give a triangular number (6670 = T₁₁₅).

The spelling of 396631 in words is "three hundred ninety-six thousand, six hundred thirty-one".