408421538 has 16 divisors (see below), whose sum is σ = 700669824. Its totient is φ = 174908160.

The previous prime is 408421499. The next prime is 408421543. The reversal of 408421538 is 835124804.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 408421498 and 408421507.

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, 10178 + ... + 30338.

It is an arithmetic number, because the mean of its divisors is an integer number (43791864).

Almost surely, 2^408421538 is an apocalyptic number.

408421538 is a deficient number, since it is larger than the sum of its proper divisors (292248286).

408421538 is a wasteful number, since it uses less digits than its factorization.

408421538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21617.

The product of its (nonzero) digits is 30720, while the sum is 35.

The square root of 408421538 is about 20209.4418032760. The cubic root of 408421538 is about 741.9412979718.

The spelling of 408421538 in words is "four hundred eight million, four hundred twenty-one thousand, five hundred thirty-eight".