400631430 has 32 divisors (see below), whose sum is σ = 983879424. Its totient is φ = 104350176.

The previous prime is 400631419. The next prime is 400631447. The reversal of 400631430 is 34136004.

It is a junction number, because it is equal to n+sod(n) for n = 400631397 and 400631406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 153994 + ... + 156573.

It is an arithmetic number, because the mean of its divisors is an integer number (30746232).

Almost surely, 2^400631430 is an apocalyptic number.

400631430 is an abundant number, since it is smaller than the sum of its proper divisors (583247994).

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

400631430 is a wasteful number, since it uses less digits than its factorization.

400631430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310620.

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 400631430 is about 20015.7795251646. The cubic root of 400631430 is about 737.1937972365.

Adding to 400631430 its reverse (34136004), we get a palindrome (434767434).

The spelling of 400631430 in words is "four hundred million, six hundred thirty-one thousand, four hundred thirty".