400320008 has 32 divisors (see below), whose sum is σ = 819624960. Its totient is φ = 181788480.

The previous prime is 400320007. The next prime is 400320017. The reversal of 400320008 is 800023004.

It is a super-2 number, since 2×400320008² = 320512217610240128, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (400320001) 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, 147641 + ... + 150327.

It is an arithmetic number, because the mean of its divisors is an integer number (25613280).

Almost surely, 2^400320008 is an apocalyptic number.

It is an amenable number.

400320008 is an abundant number, since it is smaller than the sum of its proper divisors (419304952).

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

400320008 is a wasteful number, since it uses less digits than its factorization.

400320008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4397 (or 4393 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 400320008 is about 20007.9986005597. The cubic root of 400320008 is about 737.0027339456.

The spelling of 400320008 in words is "four hundred million, three hundred twenty thousand, eight".