398908720 has 80 divisors (see below), whose sum is σ = 1062485568. Its totient is φ = 136442880.

The previous prime is 398908703. The next prime is 398908751. The reversal of 398908720 is 27809893.

It is a tau number, because it is divible by the number of its divisors (80).

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, 423450 + ... + 424390.

Almost surely, 2^398908720 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 398908720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (531242784).

398908720 is an abundant number, since it is smaller than the sum of its proper divisors (663576848).

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

398908720 is a wasteful number, since it uses less digits than its factorization.

398908720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1718 (or 1712 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 46.

The square root of 398908720 is about 19972.6993668858. The cubic root of 398908720 is about 736.1356378089.

The spelling of 398908720 in words is "three hundred ninety-eight million, nine hundred eight thousand, seven hundred twenty".