12139789 has 2 divisors, whose sum is σ = 12139790. Its totient is φ = 12139788.

The previous prime is 12139759. The next prime is 12139807. The reversal of 12139789 is 98793121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10614564 + 1525225 = 3258^2 + 1235^2 .

It is a cyclic number.

It is not a de Polignac number, because 12139789 - 2⁹ = 12139277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12139709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6069894 + 6069895.

It is an arithmetic number, because the mean of its divisors is an integer number (6069895).

Almost surely, 2^12139789 is an apocalyptic number.

It is an amenable number.

12139789 is a deficient number, since it is larger than the sum of its proper divisors (1).

12139789 is an equidigital number, since it uses as much as digits as its factorization.

12139789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27216, while the sum is 40.

The square root of 12139789 is about 3484.2199987946. The cubic root of 12139789 is about 229.8284101407.

The spelling of 12139789 in words is "twelve million, one hundred thirty-nine thousand, seven hundred eighty-nine".