82139188 has 12 divisors (see below), whose sum is σ = 146456100. Its totient is φ = 40294592.

The previous prime is 82139179. The next prime is 82139191. The reversal of 82139188 is 88193128.

It can be written as a sum of positive squares in 2 ways, for example, as 28965924 + 53173264 = 5382^2 + 7292^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 82139188.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 193513 + ... + 193936.

It is an arithmetic number, because the mean of its divisors is an integer number (12204675).

Almost surely, 2^82139188 is an apocalyptic number.

It is an amenable number.

82139188 is a deficient number, since it is larger than the sum of its proper divisors (64316912).

82139188 is a wasteful number, since it uses less digits than its factorization.

82139188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387506 (or 387504 counting only the distinct ones).

The product of its digits is 27648, while the sum is 40.

The square root of 82139188 is about 9063.0672512125. The cubic root of 82139188 is about 434.6938225075.

The spelling of 82139188 in words is "eighty-two million, one hundred thirty-nine thousand, one hundred eighty-eight".