8139439 has 12 divisors (see below), whose sum is σ = 10329768. Its totient is φ = 6342000.

The previous prime is 8139431. The next prime is 8139451. The reversal of 8139439 is 9349318.

It is not a de Polignac number, because 8139439 - 2³ = 8139431 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 8139398 and 8139407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8139431) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7012 + ... + 8089.

It is an arithmetic number, because the mean of its divisors is an integer number (860814).

Almost surely, 2^8139439 is an apocalyptic number.

8139439 is a deficient number, since it is larger than the sum of its proper divisors (2190329).

8139439 is a wasteful number, since it uses less digits than its factorization.

8139439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15126 (or 15119 counting only the distinct ones).

The product of its digits is 23328, while the sum is 37.

The square root of 8139439 is about 2852.9702066443. The cubic root of 8139439 is about 201.1553051664.

The spelling of 8139439 in words is "eight million, one hundred thirty-nine thousand, four hundred thirty-nine".