12821904 has 30 divisors (see below), whose sum is σ = 35883926. Its totient is φ = 4273920.

The previous prime is 12821899. The next prime is 12821933. The reversal of 12821904 is 40912821.

It can be written as a sum of positive squares in only one way, i.e., 7290000 + 5531904 = 2700^2 + 2352^2 .

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 44377 + ... + 44664.

Almost surely, 2^12821904 is an apocalyptic number.

It is an amenable number.

12821904 is an abundant number, since it is smaller than the sum of its proper divisors (23062022).

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

12821904 is a wasteful number, since it uses less digits than its factorization.

12821904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89055 (or 89046 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 12821904 is about 3580.7686325704. The cubic root of 12821904 is about 234.0547756932.

The spelling of 12821904 in words is "twelve million, eight hundred twenty-one thousand, nine hundred four".