400156236 has 72 divisors (see below), whose sum is σ = 1027563264. Its totient is φ = 131286240.

The previous prime is 400156219. The next prime is 400156241. The reversal of 400156236 is 632651004.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1153015 + ... + 1153361.

It is an arithmetic number, because the mean of its divisors is an integer number (14271712).

Almost surely, 2^400156236 is an apocalyptic number.

It is an amenable number.

400156236 is an abundant number, since it is smaller than the sum of its proper divisors (627407028).

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

400156236 is a wasteful number, since it uses less digits than its factorization.

400156236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 771 (or 766 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 400156236 is about 20003.9055186731. The cubic root of 400156236 is about 736.9022169653.

The spelling of 400156236 in words is "four hundred million, one hundred fifty-six thousand, two hundred thirty-six".