172272923 has 4 divisors (see below), whose sum is σ = 172473408. Its totient is φ = 172072440.

The previous prime is 172272913. The next prime is 172272941. The reversal of 172272923 is 329272271.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 172272923 - 2²² = 168078619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172272913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98948 + ... + 100673.

It is an arithmetic number, because the mean of its divisors is an integer number (43118352).

Almost surely, 2^172272923 is an apocalyptic number.

172272923 is a deficient number, since it is larger than the sum of its proper divisors (200485).

172272923 is an equidigital number, since it uses as much as digits as its factorization.

172272923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200484.

The product of its digits is 21168, while the sum is 35.

The square root of 172272923 is about 13125.2780161031. The cubic root of 172272923 is about 556.4237696712.

The spelling of 172272923 in words is "one hundred seventy-two million, two hundred seventy-two thousand, nine hundred twenty-three".