139083909 has 4 divisors (see below), whose sum is σ = 185445216. Its totient is φ = 92722604.

The previous prime is 139083871. The next prime is 139083929. The reversal of 139083909 is 909380931.

It is a happy number.

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 139083909 - 2¹² = 139079813 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139083929) 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, 23180649 + ... + 23180654.

It is an arithmetic number, because the mean of its divisors is an integer number (46361304).

Almost surely, 2^139083909 is an apocalyptic number.

It is an amenable number.

139083909 is a deficient number, since it is larger than the sum of its proper divisors (46361307).

139083909 is an equidigital number, since it uses as much as digits as its factorization.

139083909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46361306.

The product of its (nonzero) digits is 52488, while the sum is 42.

The square root of 139083909 is about 11793.3841199208. The cubic root of 139083909 is about 518.1143600957.

The spelling of 139083909 in words is "one hundred thirty-nine million, eighty-three thousand, nine hundred nine".