215172879 has 8 divisors (see below), whose sum is σ = 293894832. Its totient is φ = 139949760.

The previous prime is 215172863. The next prime is 215172899. The reversal of 215172879 is 978271512.

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

It is not a de Polignac number, because 215172879 - 2⁴ = 215172863 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 215172879.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215172899) 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, 874564 + ... + 874809.

It is an arithmetic number, because the mean of its divisors is an integer number (36736854).

Almost surely, 2^215172879 is an apocalyptic number.

215172879 is a deficient number, since it is larger than the sum of its proper divisors (78721953).

215172879 is a wasteful number, since it uses less digits than its factorization.

215172879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1749417.

The product of its digits is 70560, while the sum is 42.

The square root of 215172879 is about 14668.7722390117. The cubic root of 215172879 is about 599.2331675865.

The spelling of 215172879 in words is "two hundred fifteen million, one hundred seventy-two thousand, eight hundred seventy-nine".