400631427 has 28 divisors (see below), whose sum is σ = 686491440. Its totient is φ = 228929328.

The previous prime is 400631419. The next prime is 400631447. The reversal of 400631427 is 724136004.

400631427 is a `hidden beast` number, since 4 + 0 + 0 + 631 + 4 + 27 = 666.

It is not a de Polignac number, because 400631427 - 2³ = 400631419 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 400631427.

It is not an unprimeable number, because it can be changed into a prime (400631447) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 34152 + ... + 44357.

Almost surely, 2^400631427 is an apocalyptic number.

400631427 is a deficient number, since it is larger than the sum of its proper divisors (285860013).

400631427 is an frugal number, since it uses more digits than its factorization.

400631427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78534 (or 78519 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 400631427 is about 20015.7794502238. The cubic root of 400631427 is about 737.1937953964.

The spelling of 400631427 in words is "four hundred million, six hundred thirty-one thousand, four hundred twenty-seven".