398639232 has 80 divisors (see below), whose sum is σ = 1186374750. Its totient is φ = 132876288.

The previous prime is 398639231. The next prime is 398639233. The reversal of 398639232 is 232936893.

398639232 is a `hidden beast` number, since 3 + 9 + 8 + 639 + 2 + 3 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (398639231) and next prime (398639233).

It can be written as a sum of positive squares in only one way, i.e., 397763136 + 876096 = 19944^2 + 936^2 .

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398639231) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 8857 + ... + 29592.

Almost surely, 2^398639232 is an apocalyptic number.

398639232 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

398639232 is an abundant number, since it is smaller than the sum of its proper divisors (787735518).

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

398639232 is an equidigital number, since it uses as much as digits as its factorization.

398639232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38475 (or 38454 counting only the distinct ones).

The product of its digits is 419904, while the sum is 45.

The square root of 398639232 is about 19965.9518180326. The cubic root of 398639232 is about 735.9698317817.

The spelling of 398639232 in words is "three hundred ninety-eight million, six hundred thirty-nine thousand, two hundred thirty-two".