398918560 has 36 divisors (see below), whose sum is σ = 943042338. Its totient is φ = 159466368.

The previous prime is 398918543. The next prime is 398918573. The reversal of 398918560 is 65819893.

It can be written as a sum of positive squares in only one way, i.e., 359026704 + 39891856 = 18948^2 + 6316^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 251851 + ... + 253429.

Almost surely, 2^398918560 is an apocalyptic number.

It is an amenable number.

398918560 is an abundant number, since it is smaller than the sum of its proper divisors (544123778).

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

398918560 is an frugal number, since it uses more digits than its factorization.

398918560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3173 (or 1586 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 49.

The square root of 398918560 is about 19972.9457016235. The cubic root of 398918560 is about 736.1416905847.

Multiplying 398918560 by its product of nonzero digits (466560), we get a square (186119443353600 = 13642560²).

The spelling of 398918560 in words is "three hundred ninety-eight million, nine hundred eighteen thousand, five hundred sixty".