172869823 has 16 divisors (see below), whose sum is σ = 201922560. Its totient is φ = 144932256.

The previous prime is 172869799. The next prime is 172869869. The reversal of 172869823 is 328968271.

It is a de Polignac number, because none of the positive numbers 2^k-172869823 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172869023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 91161 + ... + 93037.

It is an arithmetic number, because the mean of its divisors is an integer number (12620160).

Almost surely, 2^172869823 is an apocalyptic number.

172869823 is a deficient number, since it is larger than the sum of its proper divisors (29052737).

172869823 is a wasteful number, since it uses less digits than its factorization.

172869823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2166.

The product of its digits is 290304, while the sum is 46.

The square root of 172869823 is about 13147.9969196832. The cubic root of 172869823 is about 557.0656706853.

The spelling of 172869823 in words is "one hundred seventy-two million, eight hundred sixty-nine thousand, eight hundred twenty-three".