8139309 has 16 divisors (see below), whose sum is σ = 11404800. Its totient is φ = 5153456.

The previous prime is 8139301. The next prime is 8139331. The reversal of 8139309 is 9039318.

It is a cyclic number.

It is not a de Polignac number, because 8139309 - 2³ = 8139301 is a prime.

8139309 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 8139309.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8139301) 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, 12022 + ... + 12680.

It is an arithmetic number, because the mean of its divisors is an integer number (712800).

Almost surely, 2^8139309 is an apocalyptic number.

It is an amenable number.

8139309 is a deficient number, since it is larger than the sum of its proper divisors (3265491).

8139309 is a wasteful number, since it uses less digits than its factorization.

8139309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 864.

The product of its (nonzero) digits is 5832, while the sum is 33.

The square root of 8139309 is about 2852.9474232800. The cubic root of 8139309 is about 201.1542342355.

Subtracting 8139309 from its reverse (9039318), we obtain a palindrome (900009).

It can be divided in two parts, 8139 and 309, that added together give a palindrome (8448).

The spelling of 8139309 in words is "eight million, one hundred thirty-nine thousand, three hundred nine".