82139799 has 16 divisors (see below), whose sum is σ = 125355008. Its totient is φ = 46865952.

The previous prime is 82139747. The next prime is 82139821. The reversal of 82139799 is 99793128.

It is not a de Polignac number, because 82139799 - 2⁷ = 82139671 is a prime.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82139899) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13314 + ... + 18480.

It is an arithmetic number, because the mean of its divisors is an integer number (7834688).

Almost surely, 2^82139799 is an apocalyptic number.

82139799 is a deficient number, since it is larger than the sum of its proper divisors (43215209).

82139799 is a wasteful number, since it uses less digits than its factorization.

82139799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5934.

The product of its digits is 244944, while the sum is 48.

The square root of 82139799 is about 9063.1009593847. The cubic root of 82139799 is about 434.6949003416.

The spelling of 82139799 in words is "eighty-two million, one hundred thirty-nine thousand, seven hundred ninety-nine".