172872415 has 4 divisors (see below), whose sum is σ = 207446904. Its totient is φ = 138297928.

The previous prime is 172872409. The next prime is 172872449. The reversal of 172872415 is 514278271.

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 172872415 - 2³ = 172872407 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17287237 + ... + 17287246.

It is an arithmetic number, because the mean of its divisors is an integer number (51861726).

Almost surely, 2^172872415 is an apocalyptic number.

172872415 is a deficient number, since it is larger than the sum of its proper divisors (34574489).

172872415 is an equidigital number, since it uses as much as digits as its factorization.

172872415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34574488.

The product of its digits is 31360, while the sum is 37.

The square root of 172872415 is about 13148.0954894616. The cubic root of 172872415 is about 557.0684548747.

The spelling of 172872415 in words is "one hundred seventy-two million, eight hundred seventy-two thousand, four hundred fifteen".