139357309 has 16 divisors (see below), whose sum is σ = 173940480. Its totient is φ = 108702720.

The previous prime is 139357301. The next prime is 139357331. The reversal of 139357309 is 903753931.

It is not a de Polignac number, because 139357309 - 2³ = 139357301 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139357301) 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, 4324 + ... + 17245.

It is an arithmetic number, because the mean of its divisors is an integer number (10871280).

Almost surely, 2^139357309 is an apocalyptic number.

It is an amenable number.

139357309 is a deficient number, since it is larger than the sum of its proper divisors (34583171).

139357309 is a wasteful number, since it uses less digits than its factorization.

139357309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21660.

The product of its (nonzero) digits is 76545, while the sum is 40.

The square root of 139357309 is about 11804.9696738281. The cubic root of 139357309 is about 518.4536271179.

The spelling of 139357309 in words is "one hundred thirty-nine million, three hundred fifty-seven thousand, three hundred nine".