138968765 has 8 divisors (see below), whose sum is σ = 179590488. Its totient is φ = 102623040.

The previous prime is 138968759. The next prime is 138968771. The reversal of 138968765 is 567869831.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (138968759) and next prime (138968771).

It can be written as a sum of positive squares in 4 ways, for example, as 4153444 + 134815321 = 2038^2 + 11611^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 138968765 - 2⁴ = 138968749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1068926 + ... + 1069055.

It is an arithmetic number, because the mean of its divisors is an integer number (22448811).

Almost surely, 2^138968765 is an apocalyptic number.

It is an amenable number.

138968765 is a deficient number, since it is larger than the sum of its proper divisors (40621723).

138968765 is a wasteful number, since it uses less digits than its factorization.

138968765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2137999.

The product of its digits is 2177280, while the sum is 53.

The square root of 138968765 is about 11788.5013890655. The cubic root of 138968765 is about 517.9713427595.

The spelling of 138968765 in words is "one hundred thirty-eight million, nine hundred sixty-eight thousand, seven hundred sixty-five".