38172039920 has 40 divisors (see below), whose sum is σ = 101428564704. Its totient is φ = 13087556352.

The previous prime is 38172039911. The next prime is 38172039929. The reversal of 38172039920 is 2993027183.

It is a happy number.

38172039920 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (38172039911) and next prime (38172039929).

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38172039929) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34081619 + ... + 34082738.

Almost surely, 2^38172039920 is an apocalyptic number.

It is an amenable number.

38172039920 is an abundant number, since it is smaller than the sum of its proper divisors (63256524784).

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

38172039920 is a wasteful number, since it uses less digits than its factorization.

38172039920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68164377 (or 68164371 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 44.

The spelling of 38172039920 in words is "thirty-eight billion, one hundred seventy-two million, thirty-nine thousand, nine hundred twenty".