400855888 has 30 divisors (see below), whose sum is σ = 789716382. Its totient is φ = 197112960.

The previous prime is 400855879. The next prime is 400855909. The reversal of 400855888 is 888558004.

It can be written as a sum of positive squares in 3 ways, for example, as 8340544 + 392515344 = 2888^2 + 19812^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 56170 + ... + 62902.

Almost surely, 2^400855888 is an apocalyptic number.

It is an amenable number.

400855888 is a deficient number, since it is larger than the sum of its proper divisors (388860494).

400855888 is an equidigital number, since it uses as much as digits as its factorization.

400855888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6863 (or 6796 counting only the distinct ones).

The product of its (nonzero) digits is 409600, while the sum is 46.

The square root of 400855888 is about 20021.3857662251. The cubic root of 400855888 is about 737.3314450765.

The spelling of 400855888 in words is "four hundred million, eight hundred fifty-five thousand, eight hundred eighty-eight".