82399985 has 8 divisors (see below), whose sum is σ = 98984040. Its totient is φ = 65850624.

The previous prime is 82399981. The next prime is 82400009. The reversal of 82399985 is 58999328.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 80656 + 82319329 = 284^2 + 9073^2 .

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 82399985 - 2² = 82399981 is a prime.

It is not an unprimeable number, because it can be changed into a prime (82399981) 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, 3122 + ... + 13211.

It is an arithmetic number, because the mean of its divisors is an integer number (12373005).

Almost surely, 2^82399985 is an apocalyptic number.

It is an amenable number.

82399985 is a deficient number, since it is larger than the sum of its proper divisors (16584055).

82399985 is a wasteful number, since it uses less digits than its factorization.

82399985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17347.

The product of its digits is 1399680, while the sum is 53.

The square root of 82399985 is about 9077.4437481044. The cubic root of 82399985 is about 435.1533963785.

The spelling of 82399985 in words is "eighty-two million, three hundred ninety-nine thousand, nine hundred eighty-five".