400488864 has 24 divisors (see below), whose sum is σ = 1051283520. Its totient is φ = 133496256.

The previous prime is 400488863. The next prime is 400488871. The reversal of 400488864 is 468884004.

It is a tau number, because it is divible by the number of its divisors (24).

It is not an unprimeable number, because it can be changed into a prime (400488863) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2085784 + ... + 2085975.

It is an arithmetic number, because the mean of its divisors is an integer number (43803480).

Almost surely, 2^400488864 is an apocalyptic number.

It is an amenable number.

400488864 is an abundant number, since it is smaller than the sum of its proper divisors (650794656).

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

400488864 is a wasteful number, since it uses less digits than its factorization.

400488864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4171772 (or 4171764 counting only the distinct ones).

The product of its (nonzero) digits is 196608, while the sum is 42.

The square root of 400488864 is about 20012.2178680925. The cubic root of 400488864 is about 737.1063425902.

The spelling of 400488864 in words is "four hundred million, four hundred eighty-eight thousand, eight hundred sixty-four".