395631 has 8 divisors (see below), whose sum is σ = 586160. Its totient is φ = 263736.

The previous prime is 395627. The next prime is 395657. The reversal of 395631 is 136593.

It is not a de Polignac number, because 395631 - 2² = 395627 is a prime.

It is a super-2 number, since 2×395631² = 313047776322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 14653 = 395631 / (3 + 9 + 5 + 6 + 3 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 395595 and 395604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (395611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7300 + ... + 7353.

It is an arithmetic number, because the mean of its divisors is an integer number (73270).

2³⁹⁵⁶³¹ is an apocalyptic number.

395631 is a deficient number, since it is larger than the sum of its proper divisors (190529).

395631 is a wasteful number, since it uses less digits than its factorization.

395631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14662 (or 14656 counting only the distinct ones).

The product of its digits is 2430, while the sum is 27.

The square root of 395631 is about 628.9920508242. The cubic root of 395631 is about 73.4113884232.

The spelling of 395631 in words is "three hundred ninety-five thousand, six hundred thirty-one".