138597765 has 16 divisors (see below), whose sum is σ = 222223488. Its totient is φ = 73763136.

The previous prime is 138597743. The next prime is 138597779. The reversal of 138597765 is 567795831.

It is not a de Polignac number, because 138597765 - 2⁷ = 138597637 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2182 + ... + 16791.

It is an arithmetic number, because the mean of its divisors is an integer number (13888968).

Almost surely, 2^138597765 is an apocalyptic number.

138597765 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138597765 is a deficient number, since it is larger than the sum of its proper divisors (83625723).

138597765 is a wasteful number, since it uses less digits than its factorization.

138597765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19468.

The product of its digits is 1587600, while the sum is 51.

The square root of 138597765 is about 11772.7552000371. The cubic root of 138597765 is about 517.5099953728.

The spelling of 138597765 in words is "one hundred thirty-eight million, five hundred ninety-seven thousand, seven hundred sixty-five".