396881940 has 96 divisors (see below), whose sum is σ = 1367735040. Its totient is φ = 83736576.

The previous prime is 396881929. The next prime is 396881981. The reversal of 396881940 is 49188693.

It is a self number, because there is not a number n which added to its sum of digits gives 396881940.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 30885 + ... + 41804.

It is an arithmetic number, because the mean of its divisors is an integer number (14247240).

Almost surely, 2^396881940 is an apocalyptic number.

396881940 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

396881940 is an abundant number, since it is smaller than the sum of its proper divisors (970853100).

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

396881940 is a wasteful number, since it uses less digits than its factorization.

396881940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72721 (or 72719 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 48.

The square root of 396881940 is about 19921.8959941066. The cubic root of 396881940 is about 734.8867982447.

The spelling of 396881940 in words is "three hundred ninety-six million, eight hundred eighty-one thousand, nine hundred forty".