398256560 has 40 divisors (see below), whose sum is σ = 997175760. Its totient is φ = 147048192.

The previous prime is 398256539. The next prime is 398256589. The reversal of 398256560 is 65652893.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 190430 + ... + 192509.

It is an arithmetic number, because the mean of its divisors is an integer number (24929394).

Almost surely, 2^398256560 is an apocalyptic number.

It is an amenable number.

398256560 is an abundant number, since it is smaller than the sum of its proper divisors (598919200).

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

398256560 is a wasteful number, since it uses less digits than its factorization.

398256560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 382965 (or 382959 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 44.

The square root of 398256560 is about 19956.3664027297. The cubic root of 398256560 is about 735.7342593718.

The spelling of 398256560 in words is "three hundred ninety-eight million, two hundred fifty-six thousand, five hundred sixty".