400670631 has 40 divisors (see below), whose sum is σ = 616304304. Its totient is φ = 259303680.

The previous prime is 400670587. The next prime is 400670657. The reversal of 400670631 is 136076004.

It is not a de Polignac number, because 400670631 - 2⁷ = 400670503 is a prime.

It is a super-2 number, since 2×400670631² = 321073909091876322, which contains 22 as substring.

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

It is a junction number, because it is equal to n+sod(n) for n = 400670595 and 400670604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400670681) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 409615 + ... + 410591.

Almost surely, 2^400670631 is an apocalyptic number.

400670631 is a deficient number, since it is larger than the sum of its proper divisors (215633673).

400670631 is an equidigital number, since it uses as much as digits as its factorization.

400670631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1133 (or 1124 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The square root of 400670631 is about 20016.7587536044. The cubic root of 400670631 is about 737.2178407749.

The spelling of 400670631 in words is "four hundred million, six hundred seventy thousand, six hundred thirty-one".