398914728 has 32 divisors (see below), whose sum is σ = 1049776800. Its totient is φ = 125972928.

The previous prime is 398914619. The next prime is 398914739. The reversal of 398914728 is 827419893.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 436951 + ... + 437862.

It is an arithmetic number, because the mean of its divisors is an integer number (32805525).

Almost surely, 2^398914728 is an apocalyptic number.

398914728 is a gapful number since it is divisible by the number (38) formed by its first and last digit.

It is an amenable number.

398914728 is an abundant number, since it is smaller than the sum of its proper divisors (650862072).

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

398914728 is a wasteful number, since it uses less digits than its factorization.

398914728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 874841 (or 874837 counting only the distinct ones).

The product of its digits is 870912, while the sum is 51.

The square root of 398914728 is about 19972.8497716275. The cubic root of 398914728 is about 736.1393334586.

The spelling of 398914728 in words is "three hundred ninety-eight million, nine hundred fourteen thousand, seven hundred twenty-eight".