400631426 has 16 divisors (see below), whose sum is σ = 647740800. Its totient is φ = 184744848.

The previous prime is 400631419. The next prime is 400631447. The reversal of 400631426 is 624136004.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a junction number, because it is equal to n+sod(n) for n = 400631395 and 400631404.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26615 + ... + 38853.

It is an arithmetic number, because the mean of its divisors is an integer number (40483800).

Almost surely, 2^400631426 is an apocalyptic number.

400631426 is a deficient number, since it is larger than the sum of its proper divisors (247109374).

400631426 is a wasteful number, since it uses less digits than its factorization.

400631426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13513.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 400631426 is about 20015.7794252435. The cubic root of 400631426 is about 737.1937947830.

The spelling of 400631426 in words is "four hundred million, six hundred thirty-one thousand, four hundred twenty-six".