408643938 has 24 divisors (see below), whose sum is σ = 889078476. Its totient is φ = 135648000.

The previous prime is 408643903. The next prime is 408643981. The reversal of 408643938 is 839346804.

It can be written as a sum of positive squares in 2 ways, for example, as 366224769 + 42419169 = 19137^2 + 6513^2 .

It is a junction number, because it is equal to n+sod(n) for n = 408643893 and 408643902.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42763 + ... + 51438.

Almost surely, 2^408643938 is an apocalyptic number.

408643938 is an abundant number, since it is smaller than the sum of its proper divisors (480434538).

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

408643938 is a wasteful number, since it uses less digits than its factorization.

408643938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94450 (or 94447 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 45.

The square root of 408643938 is about 20214.9434330151. The cubic root of 408643938 is about 742.0759446440.

The spelling of 408643938 in words is "four hundred eight million, six hundred forty-three thousand, nine hundred thirty-eight".