172842279 has 4 divisors (see below), whose sum is σ = 230456376. Its totient is φ = 115228184.

The previous prime is 172842251. The next prime is 172842289. The reversal of 172842279 is 972248271.

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 172842279 - 2⁷ = 172842151 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 172842279.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172842239) 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, 28807044 + ... + 28807049.

It is an arithmetic number, because the mean of its divisors is an integer number (57614094).

Almost surely, 2^172842279 is an apocalyptic number.

172842279 is a deficient number, since it is larger than the sum of its proper divisors (57614097).

172842279 is an equidigital number, since it uses as much as digits as its factorization.

172842279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57614096.

The product of its digits is 112896, while the sum is 42.

The square root of 172842279 is about 13146.9494180209. The cubic root of 172842279 is about 557.0360826566.

The spelling of 172842279 in words is "one hundred seventy-two million, eight hundred forty-two thousand, two hundred seventy-nine".