421956780 has 48 divisors (see below), whose sum is σ = 1350263040. Its totient is φ = 96447168.

The previous prime is 421956761. The next prime is 421956791. The reversal of 421956780 is 87659124.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (42).

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 15 ways as a sum of consecutive naturals, for example, 501910 + ... + 502749.

It is an arithmetic number, because the mean of its divisors is an integer number (28130480).

Almost surely, 2^421956780 is an apocalyptic number.

It is an amenable number.

421956780 is an abundant number, since it is smaller than the sum of its proper divisors (928306260).

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

421956780 is a wasteful number, since it uses less digits than its factorization.

421956780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1004678 (or 1004676 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 42.

The square root of 421956780 is about 20541.5865988974. The cubic root of 421956780 is about 750.0484590911.

The spelling of 421956780 in words is "four hundred twenty-one million, nine hundred fifty-six thousand, seven hundred eighty".