398880784 has 15 divisors (see below), whose sum is σ = 772986333. Its totient is φ = 199400448.

The previous prime is 398880763. The next prime is 398880793. The reversal of 398880784 is 487088893.

The square root of 398880784 is 19972.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 138768400 + 260112384 = 11780^2 + 16128^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 77392 + ... + 82384.

Almost surely, 2^398880784 is an apocalyptic number.

398880784 is the 19972-nd square number.

It is an amenable number.

398880784 is a deficient number, since it is larger than the sum of its proper divisors (374105549).

398880784 is an frugal number, since it uses more digits than its factorization.

398880784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9994 (or 4995 counting only the distinct ones).

The product of its (nonzero) digits is 3096576, while the sum is 55.

The cubic root of 398880784 is about 736.1184532884.

The spelling of 398880784 in words is "three hundred ninety-eight million, eight hundred eighty thousand, seven hundred eighty-four".