421818372 has 36 divisors (see below), whose sum is σ = 1076624640. Its totient is φ = 139239792.

The previous prime is 421818359. The next prime is 421818377. The reversal of 421818372 is 273818124.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (421818377) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 53172 + ... + 60587.

It is an arithmetic number, because the mean of its divisors is an integer number (29906240).

Almost surely, 2^421818372 is an apocalyptic number.

It is an amenable number.

421818372 is an abundant number, since it is smaller than the sum of its proper divisors (654806268).

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

421818372 is a wasteful number, since it uses less digits than its factorization.

421818372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113872 (or 113867 counting only the distinct ones).

The product of its digits is 21504, while the sum is 36.

The square root of 421818372 is about 20538.2173520488. The cubic root of 421818372 is about 749.9664411651.

The spelling of 421818372 in words is "four hundred twenty-one million, eight hundred eighteen thousand, three hundred seventy-two".