172449979 has 16 divisors (see below), whose sum is σ = 195400800. Its totient is φ = 151070976.

The previous prime is 172449973. The next prime is 172450009. The reversal of 172449979 is 979944271.

172449979 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 172449979 - 2⁹ = 172449467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172449973) 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, 18367 + ... + 26119.

It is an arithmetic number, because the mean of its divisors is an integer number (12212550).

Almost surely, 2^172449979 is an apocalyptic number.

172449979 is a deficient number, since it is larger than the sum of its proper divisors (22950821).

172449979 is a wasteful number, since it uses less digits than its factorization.

172449979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7854.

The product of its digits is 1143072, while the sum is 52.

The square root of 172449979 is about 13132.0211315700. The cubic root of 172449979 is about 556.6143286079.

The spelling of 172449979 in words is "one hundred seventy-two million, four hundred forty-nine thousand, nine hundred seventy-nine".