83638139 has 16 divisors (see below), whose sum is σ = 92850912. Its totient is φ = 74850048.

The previous prime is 83638127. The next prime is 83638141. The reversal of 83638139 is 93183638.

It is not a de Polignac number, because 83638139 - 2²⁴ = 66860923 is a prime.

It is a Smith number, since the sum of its digits (41) 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 junction number, because it is equal to n+sod(n) for n = 83638096 and 83638105.

It is not an unprimeable number, because it can be changed into a prime (83638339) 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, 87287 + ... + 88239.

It is an arithmetic number, because the mean of its divisors is an integer number (5803182).

Almost surely, 2^83638139 is an apocalyptic number.

83638139 is a deficient number, since it is larger than the sum of its proper divisors (9212773).

83638139 is a wasteful number, since it uses less digits than its factorization.

83638139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1166.

The product of its digits is 93312, while the sum is 41.

The square root of 83638139 is about 9145.3889474423. The cubic root of 83638139 is about 437.3221289458.

The spelling of 83638139 in words is "eighty-three million, six hundred thirty-eight thousand, one hundred thirty-nine".