139626609 has 4 divisors (see below), whose sum is σ = 186168816. Its totient is φ = 93084404.

The previous prime is 139626601. The next prime is 139626631. The reversal of 139626609 is 906626931.

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 a cyclic number.

It is not a de Polignac number, because 139626609 - 2³ = 139626601 is a prime.

It is not an unprimeable number, because it can be changed into a prime (139626601) 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, 23271099 + ... + 23271104.

It is an arithmetic number, because the mean of its divisors is an integer number (46542204).

Almost surely, 2^139626609 is an apocalyptic number.

It is an amenable number.

139626609 is a deficient number, since it is larger than the sum of its proper divisors (46542207).

139626609 is an equidigital number, since it uses as much as digits as its factorization.

139626609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46542206.

The product of its (nonzero) digits is 104976, while the sum is 42.

The square root of 139626609 is about 11816.3703818051. The cubic root of 139626609 is about 518.7873728530.

The spelling of 139626609 in words is "one hundred thirty-nine million, six hundred twenty-six thousand, six hundred nine".