138695789 has 2 divisors, whose sum is σ = 138695790. Its totient is φ = 138695788.

The previous prime is 138695749. The next prime is 138695807. The reversal of 138695789 is 987596831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71537764 + 67158025 = 8458^2 + 8195^2 .

It is a cyclic number.

It is not a de Polignac number, because 138695789 - 2⁸ = 138695533 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 (138695749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69347894 + 69347895.

It is an arithmetic number, because the mean of its divisors is an integer number (69347895).

Almost surely, 2^138695789 is an apocalyptic number.

It is an amenable number.

138695789 is a deficient number, since it is larger than the sum of its proper divisors (1).

138695789 is an equidigital number, since it uses as much as digits as its factorization.

138695789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3265920, while the sum is 56.

The square root of 138695789 is about 11776.9176357823. The cubic root of 138695789 is about 517.6319705123.

The spelling of 138695789 in words is "one hundred thirty-eight million, six hundred ninety-five thousand, seven hundred eighty-nine".