172972929 has 8 divisors (see below), whose sum is σ = 230950720. Its totient is φ = 115155216.

The previous prime is 172972879. The next prime is 172972931. The reversal of 172972929 is 929279271.

172972929 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 172972929 - 2⁷ = 172972801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172972939) 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, 37474 + ... + 41835.

It is an arithmetic number, because the mean of its divisors is an integer number (28868840).

Almost surely, 2^172972929 is an apocalyptic number.

It is an amenable number.

172972929 is a deficient number, since it is larger than the sum of its proper divisors (57977791).

172972929 is an equidigital number, since it uses as much as digits as its factorization.

172972929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80039.

The product of its digits is 285768, while the sum is 48.

The square root of 172972929 is about 13151.9173126963. The cubic root of 172972929 is about 557.1764002440.

The spelling of 172972929 in words is "one hundred seventy-two million, nine hundred seventy-two thousand, nine hundred twenty-nine".