398687880 has 32 divisors (see below), whose sum is σ = 1196064000. Its totient is φ = 106316736.

The previous prime is 398687857. The next prime is 398687897. The reversal of 398687880 is 88786893.

It is a self number, because there is not a number n which added to its sum of digits gives 398687880.

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, 1661080 + ... + 1661319.

It is an arithmetic number, because the mean of its divisors is an integer number (37377000).

Almost surely, 2^398687880 is an apocalyptic number.

398687880 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

398687880 is an abundant number, since it is smaller than the sum of its proper divisors (797376120).

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

398687880 is a wasteful number, since it uses less digits than its factorization.

398687880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3322413 (or 3322409 counting only the distinct ones).

The product of its (nonzero) digits is 4644864, while the sum is 57.

The square root of 398687880 is about 19967.1700548676. The cubic root of 398687880 is about 735.9997686278. Note that the first 3 decimals are identical.

The spelling of 398687880 in words is "three hundred ninety-eight million, six hundred eighty-seven thousand, eight hundred eighty".