398458755 has 12 divisors (see below), whose sum is σ = 690661920. Its totient is φ = 212511312.

The previous prime is 398458721. The next prime is 398458759. The reversal of 398458755 is 557854893.

398458755 is a `hidden beast` number, since 3 + 9 + 8 + 4 + 587 + 55 = 666.

It is not a de Polignac number, because 398458755 - 2²³ = 390070147 is a prime.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (398458759) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4427275 + ... + 4427364.

It is an arithmetic number, because the mean of its divisors is an integer number (57555160).

Almost surely, 2^398458755 is an apocalyptic number.

398458755 is a deficient number, since it is larger than the sum of its proper divisors (292203165).

398458755 is a wasteful number, since it uses less digits than its factorization.

398458755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8854650 (or 8854647 counting only the distinct ones).

The product of its digits is 6048000, while the sum is 54.

The square root of 398458755 is about 19961.4316871311. The cubic root of 398458755 is about 735.8587491565.

The spelling of 398458755 in words is "three hundred ninety-eight million, four hundred fifty-eight thousand, seven hundred fifty-five".