400057328 has 40 divisors (see below), whose sum is σ = 895322160. Its totient is φ = 171146240.

The previous prime is 400057321. The next prime is 400057393. The reversal of 400057328 is 823750004.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 400057328.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400057321) 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, 63863 + ... + 69846.

It is an arithmetic number, because the mean of its divisors is an integer number (22383054).

Almost surely, 2^400057328 is an apocalyptic number.

It is an amenable number.

400057328 is an abundant number, since it is smaller than the sum of its proper divisors (495264832).

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

400057328 is a wasteful number, since it uses less digits than its factorization.

400057328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133745 (or 133739 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 400057328 is about 20001.4331486521. The cubic root of 400057328 is about 736.8414977396.

The spelling of 400057328 in words is "four hundred million, fifty-seven thousand, three hundred twenty-eight".