421905804 has 24 divisors (see below), whose sum is σ = 1018394160. Its totient is φ = 135785664.

The previous prime is 421905797. The next prime is 421905853. The reversal of 421905804 is 408509124.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 605839 + ... + 606534.

It is an arithmetic number, because the mean of its divisors is an integer number (42433090).

Almost surely, 2^421905804 is an apocalyptic number.

It is an amenable number.

421905804 is an abundant number, since it is smaller than the sum of its proper divisors (596488356).

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

421905804 is a wasteful number, since it uses less digits than its factorization.

421905804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1212409 (or 1212407 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 421905804 is about 20540.3457614520. The cubic root of 421905804 is about 750.0182537780.

The spelling of 421905804 in words is "four hundred twenty-one million, nine hundred five thousand, eight hundred four".