398950837520 has 40 divisors (see below), whose sum is σ = 937982744280. Its totient is φ = 157787294720.

The previous prime is 398950837517. The next prime is 398950837531. The reversal of 398950837520 is 25738059893.

It can be written as a sum of positive squares in 4 ways, for example, as 8755719184 + 390195118336 = 93572^2 + 624656^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 398950837520.

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, 28009091 + ... + 28023330.

It is an arithmetic number, because the mean of its divisors is an integer number (23449568607).

Almost surely, 2^398950837520 is an apocalyptic number.

It is an amenable number.

398950837520 is an abundant number, since it is smaller than the sum of its proper divisors (539031906760).

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

398950837520 is a wasteful number, since it uses less digits than its factorization.

398950837520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56032523 (or 56032517 counting only the distinct ones).

The product of its (nonzero) digits is 16329600, while the sum is 59.

The spelling of 398950837520 in words is "three hundred ninety-eight billion, nine hundred fifty million, eight hundred thirty-seven thousand, five hundred twenty".