138757791 has 16 divisors (see below), whose sum is σ = 196750944. Its totient is φ = 86682624.

The previous prime is 138757777. The next prime is 138757799. The reversal of 138757791 is 197757831.

It is not a de Polignac number, because 138757791 - 2¹⁰ = 138756767 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 138757791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138757799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6045 + ... + 17721.

It is an arithmetic number, because the mean of its divisors is an integer number (12296934).

Almost surely, 2^138757791 is an apocalyptic number.

138757791 is a deficient number, since it is larger than the sum of its proper divisors (57993153).

138757791 is a wasteful number, since it uses less digits than its factorization.

138757791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11930.

The product of its digits is 370440, while the sum is 48.

The square root of 138757791 is about 11779.5496942795. The cubic root of 138757791 is about 517.7090923832.

The spelling of 138757791 in words is "one hundred thirty-eight million, seven hundred fifty-seven thousand, seven hundred ninety-one".