38918172 has 12 divisors (see below), whose sum is σ = 90809096. Its totient is φ = 12972720.

The previous prime is 38918171. The next prime is 38918177. The reversal of 38918172 is 27181983.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×38918172² = 3029248223643168, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 38918172.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38918171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1621579 + ... + 1621602.

Almost surely, 2^38918172 is an apocalyptic number.

It is an amenable number.

38918172 is an abundant number, since it is smaller than the sum of its proper divisors (51890924).

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

38918172 is a wasteful number, since it uses less digits than its factorization.

38918172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3243188 (or 3243186 counting only the distinct ones).

The product of its digits is 24192, while the sum is 39.

The square root of 38918172 is about 6238.4430749988. The cubic root of 38918172 is about 338.8838021194.

The spelling of 38918172 in words is "thirty-eight million, nine hundred eighteen thousand, one hundred seventy-two".