400530816 has 96 divisors (see below), whose sum is σ = 1317248400. Its totient is φ = 114435072.

The previous prime is 400530799. The next prime is 400530821. The reversal of 400530816 is 618035004.

It is a tau number, because it is divible by the number of its divisors (96).

It is a self number, because there is not a number n which added to its sum of digits gives 400530816.

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 16771 + ... + 32898.

Almost surely, 2^400530816 is an apocalyptic number.

It is an amenable number.

400530816 is an abundant number, since it is smaller than the sum of its proper divisors (916717584).

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

400530816 is a wasteful number, since it uses less digits than its factorization.

400530816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49696 (or 49681 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 400530816 is about 20013.2660003309. The cubic root of 400530816 is about 737.1320794736.

The spelling of 400530816 in words is "four hundred million, five hundred thirty thousand, eight hundred sixteen".