398705020 has 24 divisors (see below), whose sum is σ = 956892384. Its totient is φ = 136698816.

The previous prime is 398705011. The next prime is 398705053. The reversal of 398705020 is 20507893.

It is a congruent number.

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, 1423807 + ... + 1424086.

It is an arithmetic number, because the mean of its divisors is an integer number (39870516).

Almost surely, 2^398705020 is an apocalyptic number.

It is an amenable number.

398705020 is an abundant number, since it is smaller than the sum of its proper divisors (558187364).

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

398705020 is a wasteful number, since it uses less digits than its factorization.

398705020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2847909 (or 2847907 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 398705020 is about 19967.5992547928. The cubic root of 398705020 is about 736.0103156045.

The spelling of 398705020 in words is "three hundred ninety-eight million, seven hundred five thousand, twenty".