12139709 has 2 divisors, whose sum is σ = 12139710. Its totient is φ = 12139708.

The previous prime is 12139697. The next prime is 12139723. The reversal of 12139709 is 90793121.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10824100 + 1315609 = 3290^2 + 1147^2 .

It is a cyclic number.

It is not a de Polignac number, because 12139709 - 2²⁰ = 11091133 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12139739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6069854 + 6069855.

It is an arithmetic number, because the mean of its divisors is an integer number (6069855).

Almost surely, 2^12139709 is an apocalyptic number.

It is an amenable number.

12139709 is a deficient number, since it is larger than the sum of its proper divisors (1).

12139709 is an equidigital number, since it uses as much as digits as its factorization.

12139709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3402, while the sum is 32.

The square root of 12139709 is about 3484.2085184443. The cubic root of 12139709 is about 229.8279052908.

The spelling of 12139709 in words is "twelve million, one hundred thirty-nine thousand, seven hundred nine".