400987938 has 16 divisors (see below), whose sum is σ = 863666496. Its totient is φ = 123380880.

The previous prime is 400987933. The next prime is 400987949. The reversal of 400987938 is 839789004.

It is not an unprimeable number, because it can be changed into a prime (400987933) 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, 2570358 + ... + 2570513.

It is an arithmetic number, because the mean of its divisors is an integer number (53979156).

Almost surely, 2^400987938 is an apocalyptic number.

400987938 is an abundant number, since it is smaller than the sum of its proper divisors (462678558).

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

400987938 is a wasteful number, since it uses less digits than its factorization.

400987938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5140889.

The product of its (nonzero) digits is 435456, while the sum is 48.

The square root of 400987938 is about 20024.6832184682. The cubic root of 400987938 is about 737.4124001287.

The spelling of 400987938 in words is "four hundred million, nine hundred eighty-seven thousand, nine hundred thirty-eight".