42165172 has 12 divisors (see below), whose sum is σ = 84330400. Its totient is φ = 18070776.

The previous prime is 42165139. The next prime is 42165181. The reversal of 42165172 is 27156124.

42165172 is an admirable number.

It is a Harshad number since it is a multiple of its sum of digits (28), and also a Moran number because the ratio is a prime number: 1505899 = 42165172 / (4 + 2 + 1 + 6 + 5 + 1 + 7 + 2).

It is a self number, because there is not a number n which added to its sum of digits gives 42165172.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 752922 + ... + 752977.

Almost surely, 2^42165172 is an apocalyptic number.

It is an amenable number.

42165172 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

42165172 is a wasteful number, since it uses less digits than its factorization.

42165172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1505910 (or 1505908 counting only the distinct ones).

The product of its digits is 3360, while the sum is 28.

The square root of 42165172 is about 6493.4714906589. The cubic root of 42165172 is about 348.0577369302.

The spelling of 42165172 in words is "forty-two million, one hundred sixty-five thousand, one hundred seventy-two".