398561855 has 16 divisors (see below), whose sum is σ = 515968704. Its totient is φ = 294428160.

The previous prime is 398561843. The next prime is 398561887. The reversal of 398561855 is 558165893.

It is not a de Polignac number, because 398561855 - 2²² = 394367551 is a prime.

It is a super-2 number, since 2×398561855² = 317703104522082050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39731 + ... + 48740.

It is an arithmetic number, because the mean of its divisors is an integer number (32248044).

Almost surely, 2^398561855 is an apocalyptic number.

398561855 is a deficient number, since it is larger than the sum of its proper divisors (117406849).

398561855 is a wasteful number, since it uses less digits than its factorization.

398561855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88546.

The product of its digits is 1296000, while the sum is 50.

The square root of 398561855 is about 19964.0140001955. The cubic root of 398561855 is about 735.9222107600.

The spelling of 398561855 in words is "three hundred ninety-eight million, five hundred sixty-one thousand, eight hundred fifty-five".