139612909 has 8 divisors (see below), whose sum is σ = 141853248. Its totient is φ = 137380320.

The previous prime is 139612859. The next prime is 139612927. The reversal of 139612909 is 909216931.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 139612909 - 2⁹ = 139612397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139612999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42214 + ... + 45400.

It is an arithmetic number, because the mean of its divisors is an integer number (17731656).

Almost surely, 2^139612909 is an apocalyptic number.

It is an amenable number.

139612909 is a deficient number, since it is larger than the sum of its proper divisors (2240339).

139612909 is an equidigital number, since it uses as much as digits as its factorization.

139612909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3875.

The product of its (nonzero) digits is 26244, while the sum is 40.

The square root of 139612909 is about 11815.7906633454. The cubic root of 139612909 is about 518.7704046941.

The spelling of 139612909 in words is "one hundred thirty-nine million, six hundred twelve thousand, nine hundred nine".