172172307 has 4 divisors (see below), whose sum is σ = 229563080. Its totient is φ = 114781536.

The previous prime is 172172293. The next prime is 172172339. The reversal of 172172307 is 703271271.

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

It is not a de Polignac number, because 172172307 - 2⁸ = 172172051 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172172347) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28695382 + ... + 28695387.

It is an arithmetic number, because the mean of its divisors is an integer number (57390770).

Almost surely, 2^172172307 is an apocalyptic number.

172172307 is a deficient number, since it is larger than the sum of its proper divisors (57390773).

172172307 is an equidigital number, since it uses as much as digits as its factorization.

172172307 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57390772.

The product of its (nonzero) digits is 4116, while the sum is 30.

The square root of 172172307 is about 13121.4445470002. Note that the first 3 decimals coincide. The cubic root of 172172307 is about 556.3154221415.

The spelling of 172172307 in words is "one hundred seventy-two million, one hundred seventy-two thousand, three hundred seven".