4172138872 has 64 divisors (see below), whose sum is σ = 8629286400. Its totient is φ = 1875363840.

The previous prime is 4172138857. The next prime is 4172138897. The reversal of 4172138872 is 2788312714.

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3427608 + ... + 3428824.

It is an arithmetic number, because the mean of its divisors is an integer number (134832600).

Almost surely, 2^4172138872 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 4172138872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4314643200).

4172138872 is an abundant number, since it is smaller than the sum of its proper divisors (4457147528).

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

4172138872 is a wasteful number, since it uses less digits than its factorization.

4172138872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1636 (or 1632 counting only the distinct ones).

The product of its digits is 150528, while the sum is 43.

The square root of 4172138872 is about 64592.0960489749. The cubic root of 4172138872 is about 1609.8531136650.

The spelling of 4172138872 in words is "four billion, one hundred seventy-two million, one hundred thirty-eight thousand, eight hundred seventy-two".