421955172 has 18 divisors (see below), whose sum is σ = 1066608998. Its totient is φ = 140651712.

The previous prime is 421955161. The next prime is 421955179. The reversal of 421955172 is 271559124.

It can be written as a sum of positive squares in only one way, i.e., 247873536 + 174081636 = 15744^2 + 13194^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 11720977 = 421955172 / (4 + 2 + 1 + 9 + 5 + 5 + 1 + 7 + 2).

It is not an unprimeable number, because it can be changed into a prime (421955179) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5860453 + ... + 5860524.

Almost surely, 2^421955172 is an apocalyptic number.

It is an amenable number.

421955172 is an abundant number, since it is smaller than the sum of its proper divisors (644653826).

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

421955172 is a wasteful number, since it uses less digits than its factorization.

421955172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11720987 (or 11720982 counting only the distinct ones).

The product of its digits is 25200, while the sum is 36.

The square root of 421955172 is about 20541.5474587481. The cubic root of 421955172 is about 750.0475063241.

The spelling of 421955172 in words is "four hundred twenty-one million, nine hundred fifty-five thousand, one hundred seventy-two".