398890764 has 96 divisors (see below), whose sum is σ = 1073838080. Its totient is φ = 127915200.

The previous prime is 398890741. The next prime is 398890787. The reversal of 398890764 is 467098893.

It is an interprime number because it is at equal distance from previous prime (398890741) and next prime (398890787).

It is a super-2 number, since 2×398890764² = 318227683209007392, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 398890764.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 947274 + ... + 947694.

Almost surely, 2^398890764 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 398890764, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (536919040).

398890764 is an abundant number, since it is smaller than the sum of its proper divisors (674947316).

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

398890764 is a wasteful number, since it uses less digits than its factorization.

398890764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 748 (or 740 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 54.

The square root of 398890764 is about 19972.2498482269. The cubic root of 398890764 is about 736.1245924668.

The spelling of 398890764 in words is "three hundred ninety-eight million, eight hundred ninety thousand, seven hundred sixty-four".