138115757 has 24 divisors (see below), whose sum is σ = 158393088. Its totient is φ = 120182400.

The previous prime is 138115741. The next prime is 138115763. The reversal of 138115757 is 757511831.

It is not a de Polignac number, because 138115757 - 2⁴ = 138115741 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 138115757.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138115727) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 214478 + ... + 215120.

It is an arithmetic number, because the mean of its divisors is an integer number (6599712).

Almost surely, 2^138115757 is an apocalyptic number.

It is an amenable number.

138115757 is a deficient number, since it is larger than the sum of its proper divisors (20277331).

138115757 is a wasteful number, since it uses less digits than its factorization.

138115757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 741 (or 728 counting only the distinct ones).

The product of its digits is 29400, while the sum is 38.

The square root of 138115757 is about 11752.2660368118. The cubic root of 138115757 is about 516.9093755731.

The spelling of 138115757 in words is "one hundred thirty-eight million, one hundred fifteen thousand, seven hundred fifty-seven".