421973764 has 9 divisors (see below), whose sum is σ = 738525991. Its totient is φ = 210966340.

The previous prime is 421973759. The next prime is 421973777. The reversal of 421973764 is 467379124.

The square root of 421973764 is 20542.

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

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 421973764.

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, 35949 + ... + 46219.

Almost surely, 2^421973764 is an apocalyptic number.

421973764 is the 20542-nd square number.

It is an amenable number.

421973764 is a deficient number, since it is larger than the sum of its proper divisors (316552227).

421973764 is an frugal number, since it uses more digits than its factorization.

421973764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20546 (or 10273 counting only the distinct ones).

The product of its digits is 254016, while the sum is 43.

The cubic root of 421973764 is about 750.0585222482.

Multiplying 421973764 by its product of digits (254016), we get a square (107188087636224 = 10353168²).

The spelling of 421973764 in words is "four hundred twenty-one million, nine hundred seventy-three thousand, seven hundred sixty-four".