398777832 has 24 divisors (see below), whose sum is σ = 1080023490. Its totient is φ = 132925920.

The previous prime is 398777809. The next prime is 398777837. The reversal of 398777832 is 238777893.

It can be written as a sum of positive squares in only one way, i.e., 328116996 + 70660836 = 18114^2 + 8406^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is not an unprimeable number, because it can be changed into a prime (398777837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2769219 + ... + 2769362.

Almost surely, 2^398777832 is an apocalyptic number.

It is an amenable number.

398777832 is an abundant number, since it is smaller than the sum of its proper divisors (681245658).

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

398777832 is a wasteful number, since it uses less digits than its factorization.

398777832 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5538593 (or 5538586 counting only the distinct ones).

The product of its digits is 3556224, while the sum is 54.

The square root of 398777832 is about 19969.4224252981. The cubic root of 398777832 is about 736.0551165797.

The spelling of 398777832 in words is "three hundred ninety-eight million, seven hundred seventy-seven thousand, eight hundred thirty-two".