139299609 has 4 divisors (see below), whose sum is σ = 185732816. Its totient is φ = 92866404.

The previous prime is 139299607. The next prime is 139299613. The reversal of 139299609 is 906992931.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 139299609 - 2¹ = 139299607 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139299607) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23216599 + ... + 23216604.

It is an arithmetic number, because the mean of its divisors is an integer number (46433204).

Almost surely, 2^139299609 is an apocalyptic number.

It is an amenable number.

139299609 is a deficient number, since it is larger than the sum of its proper divisors (46433207).

139299609 is an equidigital number, since it uses as much as digits as its factorization.

139299609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46433206.

The product of its (nonzero) digits is 236196, while the sum is 48.

The square root of 139299609 is about 11802.5255348167. The cubic root of 139299609 is about 518.3820631070.

The spelling of 139299609 in words is "one hundred thirty-nine million, two hundred ninety-nine thousand, six hundred nine".