400631406 has 32 divisors (see below), whose sum is σ = 922951680. Its totient is φ = 113563296.

The previous prime is 400631369. The next prime is 400631419. The reversal of 400631406 is 604136004.

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, 32221 + ... + 42888.

It is an arithmetic number, because the mean of its divisors is an integer number (28842240).

Almost surely, 2^400631406 is an apocalyptic number.

400631406 is an abundant number, since it is smaller than the sum of its proper divisors (522320274).

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

400631406 is a wasteful number, since it uses less digits than its factorization.

400631406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75248.

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 400631406 is about 20015.7789256376. The cubic root of 400631406 is about 737.1937825158.

The spelling of 400631406 in words is "four hundred million, six hundred thirty-one thousand, four hundred six".