400345136 has 40 divisors (see below), whose sum is σ = 795812160. Its totient is φ = 194999616.

The previous prime is 400345109. The next prime is 400345139. The reversal of 400345136 is 631543004.

It is not an unprimeable number, because it can be changed into a prime (400345139) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 452951 + ... + 453833.

It is an arithmetic number, because the mean of its divisors is an integer number (19895304).

Almost surely, 2^400345136 is an apocalyptic number.

It is an amenable number.

400345136 is a deficient number, since it is larger than the sum of its proper divisors (395467024).

400345136 is a wasteful number, since it uses less digits than its factorization.

400345136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1593 (or 1587 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 26.

The square root of 400345136 is about 20008.6265395704. The cubic root of 400345136 is about 737.0181541235.

The spelling of 400345136 in words is "four hundred million, three hundred forty-five thousand, one hundred thirty-six".