398157900 has 72 divisors (see below), whose sum is σ = 1316582400. Its totient is φ = 91007040.

The previous prime is 398157887. The next prime is 398157911. The reversal of 398157900 is 9751893.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 92700 + ... + 96899.

Almost surely, 2^398157900 is an apocalyptic number.

398157900 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

398157900 is an abundant number, since it is smaller than the sum of its proper divisors (918424500).

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

398157900 is a wasteful number, since it uses less digits than its factorization.

398157900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189623 (or 189616 counting only the distinct ones).

The product of its (nonzero) digits is 68040, while the sum is 42.

The square root of 398157900 is about 19953.8943567415. The cubic root of 398157900 is about 735.6734999317.

The spelling of 398157900 in words is "three hundred ninety-eight million, one hundred fifty-seven thousand, nine hundred".