8138539 has 2 divisors, whose sum is σ = 8138540. Its totient is φ = 8138538.

The previous prime is 8138513. The next prime is 8138549. The reversal of 8138539 is 9358318.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8138539 - 2¹⁵ = 8105771 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 8138498 and 8138507.

It is not a weakly prime, because it can be changed into another prime (8138509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4069269 + 4069270.

It is an arithmetic number, because the mean of its divisors is an integer number (4069270).

Almost surely, 2^8138539 is an apocalyptic number.

8138539 is a deficient number, since it is larger than the sum of its proper divisors (1).

8138539 is an equidigital number, since it uses as much as digits as its factorization.

8138539 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 37.

The square root of 8138539 is about 2852.8124719301. The cubic root of 8138539 is about 201.1478907959.

The spelling of 8138539 in words is "eight million, one hundred thirty-eight thousand, five hundred thirty-nine".