400538634 has 16 divisors (see below), whose sum is σ = 805554720. Its totient is φ = 132766640.

The previous prime is 400538623. The next prime is 400538641. The reversal of 400538634 is 436835004.

It is a junction number, because it is equal to n+sod(n) for n = 400538595 and 400538604.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 185397 + ... + 187544.

It is an arithmetic number, because the mean of its divisors is an integer number (50347170).

Almost surely, 2^400538634 is an apocalyptic number.

400538634 is an abundant number, since it is smaller than the sum of its proper divisors (405016086).

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

400538634 is a wasteful number, since it uses less digits than its factorization.

400538634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 373125.

The product of its (nonzero) digits is 34560, while the sum is 33.

The square root of 400538634 is about 20013.4613198217. The cubic root of 400538634 is about 737.1368754934.

The spelling of 400538634 in words is "four hundred million, five hundred thirty-eight thousand, six hundred thirty-four".