82172239 has 4 divisors (see below), whose sum is σ = 82799640. Its totient is φ = 81544840.

The previous prime is 82172221. The next prime is 82172243. The reversal of 82172239 is 93227128.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-82172239 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 (82172249) 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, 313504 + ... + 313765.

It is an arithmetic number, because the mean of its divisors is an integer number (20699910).

Almost surely, 2^82172239 is an apocalyptic number.

82172239 is a deficient number, since it is larger than the sum of its proper divisors (627401).

82172239 is a wasteful number, since it uses less digits than its factorization.

82172239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 627400.

The product of its digits is 12096, while the sum is 34.

The square root of 82172239 is about 9064.8904571429. The cubic root of 82172239 is about 434.7521184289.

The spelling of 82172239 in words is "eighty-two million, one hundred seventy-two thousand, two hundred thirty-nine".