421718172 has 24 divisors (see below), whose sum is σ = 1015752192. Its totient is φ = 136038000.

The previous prime is 421718149. The next prime is 421718183. The reversal of 421718172 is 271817124.

It is a congruent 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 7 ways as a sum of consecutive naturals, for example, 566454 + ... + 567197.

It is an arithmetic number, because the mean of its divisors is an integer number (42323008).

Almost surely, 2^421718172 is an apocalyptic number.

It is an amenable number.

421718172 is an abundant number, since it is smaller than the sum of its proper divisors (594034020).

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

421718172 is a wasteful number, since it uses less digits than its factorization.

421718172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1133689 (or 1133687 counting only the distinct ones).

The product of its digits is 6272, while the sum is 33.

The square root of 421718172 is about 20535.7778523240. Note that the first 3 decimals coincide. The cubic root of 421718172 is about 749.9070533706.

The spelling of 421718172 in words is "four hundred twenty-one million, seven hundred eighteen thousand, one hundred seventy-two".