138765787 has 2 divisors, whose sum is σ = 138765788. Its totient is φ = 138765786.

The previous prime is 138765779. The next prime is 138765857. The reversal of 138765787 is 787567831.

138765787 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 138765787 - 2³ = 138765779 is a prime.

It is not a weakly prime, because it can be changed into another prime (138765587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69382893 + 69382894.

It is an arithmetic number, because the mean of its divisors is an integer number (69382894).

Almost surely, 2^138765787 is an apocalyptic number.

138765787 is a deficient number, since it is larger than the sum of its proper divisors (1).

138765787 is an equidigital number, since it uses as much as digits as its factorization.

138765787 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1975680, while the sum is 52.

The square root of 138765787 is about 11779.8890911587. The cubic root of 138765787 is about 517.7190366233.

The spelling of 138765787 in words is "one hundred thirty-eight million, seven hundred sixty-five thousand, seven hundred eighty-seven".