396631566 has 20 divisors (see below), whose sum is σ = 888748872. Its totient is φ = 132210468.

The previous prime is 396631553. The next prime is 396631567. The reversal of 396631566 is 665136693.

396631566 is a `hidden beast` number, since 3 + 9 + 6 + 631 + 5 + 6 + 6 = 666.

It is a super-2 number, since 2×396631566² = 314633198295224712, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (396631567) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1224010 + ... + 1224333.

Almost surely, 2^396631566 is an apocalyptic number.

396631566 is an abundant number, since it is smaller than the sum of its proper divisors (492117306).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

396631566 is a wasteful number, since it uses less digits than its factorization.

396631566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2448357 (or 2448348 counting only the distinct ones).

The product of its digits is 524880, while the sum is 45.

The square root of 396631566 is about 19915.6111128933. The cubic root of 396631566 is about 734.7322306568.

The spelling of 396631566 in words is "three hundred ninety-six million, six hundred thirty-one thousand, five hundred sixty-six".