172863138 has 16 divisors (see below), whose sum is σ = 395115840. Its totient is φ = 49389456.

The previous prime is 172863137. The next prime is 172863143. The reversal of 172863138 is 831368271.

172863138 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 172863096 and 172863105.

It is not an unprimeable number, because it can be changed into a prime (172863137) 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, 2057853 + ... + 2057936.

It is an arithmetic number, because the mean of its divisors is an integer number (24694740).

Almost surely, 2^172863138 is an apocalyptic number.

172863138 is an abundant number, since it is smaller than the sum of its proper divisors (222252702).

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

172863138 is a wasteful number, since it uses less digits than its factorization.

172863138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4115801.

The product of its digits is 48384, while the sum is 39.

The square root of 172863138 is about 13147.7426959916. The cubic root of 172863138 is about 557.0584898831.

The spelling of 172863138 in words is "one hundred seventy-two million, eight hundred sixty-three thousand, one hundred thirty-eight".