400823900 has 18 divisors (see below), whose sum is σ = 869788080. Its totient is φ = 160329520.

The previous prime is 400823879. The next prime is 400823903. The reversal of 400823900 is 9328004.

It is a super-2 number, since 2×400823900² = 321319597622420000, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 400823900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400823903) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2004020 + ... + 2004219.

It is an arithmetic number, because the mean of its divisors is an integer number (48321560).

Almost surely, 2^400823900 is an apocalyptic number.

It is an amenable number.

400823900 is an abundant number, since it is smaller than the sum of its proper divisors (468964180).

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

400823900 is a wasteful number, since it uses less digits than its factorization.

400823900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4008253 (or 4008246 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 400823900 is about 20020.5869044841. The cubic root of 400823900 is about 737.3118317222.

The spelling of 400823900 in words is "four hundred million, eight hundred twenty-three thousand, nine hundred".