139740109 has 4 divisors (see below), whose sum is σ = 140520960. Its totient is φ = 138959260.

The previous prime is 139740103. The next prime is 139740127. The reversal of 139740109 is 901047931.

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 139740109 - 2³ = 139740101 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 (139740101) 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, 390157 + ... + 390514.

It is an arithmetic number, because the mean of its divisors is an integer number (35130240).

Almost surely, 2^139740109 is an apocalyptic number.

It is an amenable number.

139740109 is a deficient number, since it is larger than the sum of its proper divisors (780851).

139740109 is an equidigital number, since it uses as much as digits as its factorization.

139740109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 780850.

The product of its (nonzero) digits is 6804, while the sum is 34.

The square root of 139740109 is about 11821.1720654087. The cubic root of 139740109 is about 518.9279058064.

The spelling of 139740109 in words is "one hundred thirty-nine million, seven hundred forty thousand, one hundred nine".