421816828 has 6 divisors (see below), whose sum is σ = 738179456. Its totient is φ = 210908412.

The previous prime is 421816817. The next prime is 421816831. The reversal of 421816828 is 828618124.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52727100 + ... + 52727107.

Almost surely, 2^421816828 is an apocalyptic number.

It is an amenable number.

421816828 is a deficient number, since it is larger than the sum of its proper divisors (316362628).

421816828 is a wasteful number, since it uses less digits than its factorization.

421816828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105454211 (or 105454209 counting only the distinct ones).

The product of its digits is 49152, while the sum is 40.

The square root of 421816828 is about 20538.1797635526. The cubic root of 421816828 is about 749.9655261191.

The spelling of 421816828 in words is "four hundred twenty-one million, eight hundred sixteen thousand, eight hundred twenty-eight".