172668939 has 4 divisors (see below), whose sum is σ = 230225256. Its totient is φ = 115112624.

The previous prime is 172668919. The next prime is 172668943. The reversal of 172668939 is 939866271.

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 172668939 - 2¹¹ = 172666891 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 172668891 and 172668900.

It is not an unprimeable number, because it can be changed into a prime (172668919) 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, 28778154 + ... + 28778159.

It is an arithmetic number, because the mean of its divisors is an integer number (57556314).

Almost surely, 2^172668939 is an apocalyptic number.

172668939 is a deficient number, since it is larger than the sum of its proper divisors (57556317).

172668939 is an equidigital number, since it uses as much as digits as its factorization.

172668939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57556316.

The product of its digits is 979776, while the sum is 51.

The square root of 172668939 is about 13140.3553604916. The cubic root of 172668939 is about 556.8498069927.

The spelling of 172668939 in words is "one hundred seventy-two million, six hundred sixty-eight thousand, nine hundred thirty-nine".