400493688 has 32 divisors (see below), whose sum is σ = 1144268160. Its totient is φ = 114426720.

The previous prime is 400493677. The next prime is 400493689. The reversal of 400493688 is 886394004.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400493689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1191778 + ... + 1192113.

It is an arithmetic number, because the mean of its divisors is an integer number (35758380).

Almost surely, 2^400493688 is an apocalyptic number.

It is an amenable number.

400493688 is an abundant number, since it is smaller than the sum of its proper divisors (743774472).

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

400493688 is a wasteful number, since it uses less digits than its factorization.

400493688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2383907 (or 2383903 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 42.

The square root of 400493688 is about 20012.3383941008. The cubic root of 400493688 is about 737.1093021288.

The spelling of 400493688 in words is "four hundred million, four hundred ninety-three thousand, six hundred eighty-eight".