138709933 has 2 divisors, whose sum is σ = 138709934. Its totient is φ = 138709932.

The previous prime is 138709877. The next prime is 138709943. The reversal of 138709933 is 339907831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 118657449 + 20052484 = 10893^2 + 4478^2 .

It is a cyclic number.

It is not a de Polignac number, because 138709933 - 2²¹ = 136612781 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 138709933.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138709943) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69354966 + 69354967.

It is an arithmetic number, because the mean of its divisors is an integer number (69354967).

Almost surely, 2^138709933 is an apocalyptic number.

It is an amenable number.

138709933 is a deficient number, since it is larger than the sum of its proper divisors (1).

138709933 is an equidigital number, since it uses as much as digits as its factorization.

138709933 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 122472, while the sum is 43.

The square root of 138709933 is about 11777.5181171586. The cubic root of 138709933 is about 517.6495657058.

The spelling of 138709933 in words is "one hundred thirty-eight million, seven hundred nine thousand, nine hundred thirty-three".