396809989904 has 40 divisors (see below), whose sum is σ = 814118047128. Its totient is φ = 186717132800.

The previous prime is 396809989889. The next prime is 396809989913. The reversal of 396809989904 is 409989908693.

It can be written as a sum of positive squares in 4 ways, for example, as 353254299904 + 43555690000 = 594352^2 + 208700^2 .

It is a super-2 number, since 2×396809989904² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3231194 + ... + 3351750.

Almost surely, 2^396809989904 is an apocalyptic number.

396809989904 is a gapful number since it is divisible by the number (34) formed by its first and last digit.

It is an amenable number.

396809989904 is an abundant number, since it is smaller than the sum of its proper divisors (417308057224).

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

396809989904 is a wasteful number, since it uses less digits than its factorization.

396809989904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132683 (or 132677 counting only the distinct ones).

The product of its (nonzero) digits is 272097792, while the sum is 74.

The spelling of 396809989904 in words is "three hundred ninety-six billion, eight hundred nine million, nine hundred eighty-nine thousand, nine hundred four".