421645156 has 9 divisors (see below), whose sum is σ = 737950899. Its totient is φ = 210802044.

The previous prime is 421645099. The next prime is 421645171. The reversal of 421645156 is 651546124.

The square root of 421645156 is 20534.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

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 2 ways as a sum of consecutive naturals, for example, 35935 + ... + 46201.

Almost surely, 2^421645156 is an apocalyptic number.

421645156 is the 20534-th square number.

It is an amenable number.

421645156 is a deficient number, since it is larger than the sum of its proper divisors (316305743).

421645156 is an frugal number, since it uses more digits than its factorization.

421645156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20538 (or 10269 counting only the distinct ones).

The product of its digits is 28800, while the sum is 34.

The cubic root of 421645156 is about 749.8637714053.

The spelling of 421645156 in words is "four hundred twenty-one million, six hundred forty-five thousand, one hundred fifty-six".