79138539 has 12 divisors (see below), whose sum is σ = 118545336. Its totient is φ = 52758864.

The previous prime is 79138537. The next prime is 79138547. The reversal of 79138539 is 93583197.

It is a happy number.

It is not a de Polignac number, because 79138539 - 2¹ = 79138537 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 79138494 and 79138503.

It is not an unprimeable number, because it can be changed into a prime (79138537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 162594 + ... + 163079.

It is an arithmetic number, because the mean of its divisors is an integer number (9878778).

Almost surely, 2^79138539 is an apocalyptic number.

79138539 is a deficient number, since it is larger than the sum of its proper divisors (39406797).

79138539 is an equidigital number, since it uses as much as digits as its factorization.

79138539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325688 (or 325676 counting only the distinct ones).

The product of its digits is 204120, while the sum is 45.

The square root of 79138539 is about 8895.9844311914. The cubic root of 79138539 is about 429.3347184804.

The spelling of 79138539 in words is "seventy-nine million, one hundred thirty-eight thousand, five hundred thirty-nine".