400900028 has 12 divisors (see below), whose sum is σ = 732078480. Its totient is φ = 191734752.

The previous prime is 400899937. The next prime is 400900037. The reversal of 400900028 is 820009004.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a junction number, because it is equal to n+sod(n) for n = 400899976 and 400900012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2178713 + ... + 2178896.

It is an arithmetic number, because the mean of its divisors is an integer number (61006540).

Almost surely, 2^400900028 is an apocalyptic number.

It is an amenable number.

400900028 is a deficient number, since it is larger than the sum of its proper divisors (331178452).

400900028 is a wasteful number, since it uses less digits than its factorization.

400900028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4357636 (or 4357634 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 400900028 is about 20022.4880571821. The cubic root of 400900028 is about 737.3585076830.

The spelling of 400900028 in words is "four hundred million, nine hundred thousand, twenty-eight".