138787767 has 6 divisors (see below), whose sum is σ = 200471232. Its totient is φ = 92525172.

The previous prime is 138787741. The next prime is 138787769. The reversal of 138787767 is 767787831.

It is not a de Polignac number, because 138787767 - 2¹⁵ = 138754999 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138787769) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7710423 + ... + 7710440.

It is an arithmetic number, because the mean of its divisors is an integer number (33411872).

Almost surely, 2^138787767 is an apocalyptic number.

138787767 is a deficient number, since it is larger than the sum of its proper divisors (61683465).

138787767 is a wasteful number, since it uses less digits than its factorization.

138787767 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15420869 (or 15420866 counting only the distinct ones).

The product of its digits is 2765952, while the sum is 54.

The square root of 138787767 is about 11780.8220001832. The cubic root of 138787767 is about 517.7463701227.

The spelling of 138787767 in words is "one hundred thirty-eight million, seven hundred eighty-seven thousand, seven hundred sixty-seven".