86172823 has 4 divisors (see below), whose sum is σ = 94006728. Its totient is φ = 78338920.

The previous prime is 86172799. The next prime is 86172829. The reversal of 86172823 is 32827168.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 86172823 - 2⁵ = 86172791 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86172829) 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 3 ways as a sum of consecutive naturals, for example, 3916936 + ... + 3916957.

It is an arithmetic number, because the mean of its divisors is an integer number (23501682).

Almost surely, 2^86172823 is an apocalyptic number.

86172823 is a deficient number, since it is larger than the sum of its proper divisors (7833905).

86172823 is a wasteful number, since it uses less digits than its factorization.

86172823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7833904.

The product of its digits is 32256, while the sum is 37.

The square root of 86172823 is about 9282.9318105866. The cubic root of 86172823 is about 441.6959734360.

The spelling of 86172823 in words is "eighty-six million, one hundred seventy-two thousand, eight hundred twenty-three".