138768265 has 4 divisors (see below), whose sum is σ = 166521924. Its totient is φ = 111014608.

The previous prime is 138768251. The next prime is 138768283. The reversal of 138768265 is 562867831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 562867831 = 131 ⋅4296701.

It can be written as a sum of positive squares in 2 ways, for example, as 90992521 + 47775744 = 9539^2 + 6912^2 .

It is a cyclic number.

It is not a de Polignac number, because 138768265 - 2⁵ = 138768233 is a prime.

It is a super-2 number, since 2×138768265² = 38513262742220450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 13876822 + ... + 13876831.

It is an arithmetic number, because the mean of its divisors is an integer number (41630481).

Almost surely, 2^138768265 is an apocalyptic number.

It is an amenable number.

138768265 is a deficient number, since it is larger than the sum of its proper divisors (27753659).

138768265 is an equidigital number, since it uses as much as digits as its factorization.

138768265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27753658.

The product of its digits is 483840, while the sum is 46.

The square root of 138768265 is about 11779.9942699477. The cubic root of 138768265 is about 517.7221183151.

The spelling of 138768265 in words is "one hundred thirty-eight million, seven hundred sixty-eight thousand, two hundred sixty-five".