138656759 has 2 divisors, whose sum is σ = 138656760. Its totient is φ = 138656758.

The previous prime is 138656753. The next prime is 138656761. The reversal of 138656759 is 957656831.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138656759 is a prime.

Together with 138656761, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138656753) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69328379 + 69328380.

It is an arithmetic number, because the mean of its divisors is an integer number (69328380).

Almost surely, 2^138656759 is an apocalyptic number.

138656759 is a deficient number, since it is larger than the sum of its proper divisors (1).

138656759 is an equidigital number, since it uses as much as digits as its factorization.

138656759 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1360800, while the sum is 50.

The square root of 138656759 is about 11775.2604642105. The cubic root of 138656759 is about 517.5834108279.

The spelling of 138656759 in words is "one hundred thirty-eight million, six hundred fifty-six thousand, seven hundred fifty-nine".