172115827 has 8 divisors (see below), whose sum is σ = 189876960. Its totient is φ = 155000640.

The previous prime is 172115809. The next prime is 172115843. The reversal of 172115827 is 728511271.

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

It is a cyclic number.

It is not a de Polignac number, because 172115827 - 2²³ = 163727219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 172115792 and 172115801.

It is not an unprimeable number, because it can be changed into a prime (172115887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 160927 + ... + 161992.

It is an arithmetic number, because the mean of its divisors is an integer number (23734620).

Almost surely, 2^172115827 is an apocalyptic number.

172115827 is a deficient number, since it is larger than the sum of its proper divisors (17761133).

172115827 is a wasteful number, since it uses less digits than its factorization.

172115827 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322973.

The product of its digits is 7840, while the sum is 34.

The square root of 172115827 is about 13119.2921684060. The cubic root of 172115827 is about 556.2545836091.

The spelling of 172115827 in words is "one hundred seventy-two million, one hundred fifteen thousand, eight hundred twenty-seven".