172656379 has 4 divisors (see below), whose sum is σ = 197321584. Its totient is φ = 147991176.

The previous prime is 172656353. The next prime is 172656397. The reversal of 172656379 is 973656271.

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 172656379 - 2²⁷ = 38438651 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172656349) 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, 12332592 + ... + 12332605.

It is an arithmetic number, because the mean of its divisors is an integer number (49330396).

Almost surely, 2^172656379 is an apocalyptic number.

172656379 is a deficient number, since it is larger than the sum of its proper divisors (24665205).

172656379 is an equidigital number, since it uses as much as digits as its factorization.

172656379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24665204.

The product of its digits is 476280, while the sum is 46.

The square root of 172656379 is about 13139.8774347404. The cubic root of 172656379 is about 556.8363048477.

The spelling of 172656379 in words is "one hundred seventy-two million, six hundred fifty-six thousand, three hundred seventy-nine".