83138839 has 6 divisors (see below), whose sum is σ = 96712584. Its totient is φ = 71261820.

The previous prime is 83138801. The next prime is 83138843. The reversal of 83138839 is 93883138.

It is a happy number.

It is not a de Polignac number, because 83138839 - 2⁷ = 83138711 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 83138795 and 83138804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83138849) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 848307 + ... + 848404.

It is an arithmetic number, because the mean of its divisors is an integer number (16118764).

Almost surely, 2^83138839 is an apocalyptic number.

83138839 is a deficient number, since it is larger than the sum of its proper divisors (13573745).

83138839 is a wasteful number, since it uses less digits than its factorization.

83138839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1696725 (or 1696718 counting only the distinct ones).

The product of its digits is 124416, while the sum is 43.

The square root of 83138839 is about 9118.0501753390. The cubic root of 83138839 is about 436.4501547579.

The spelling of 83138839 in words is "eighty-three million, one hundred thirty-eight thousand, eight hundred thirty-nine".