138393065 has 4 divisors (see below), whose sum is σ = 166071684. Its totient is φ = 110714448.

The previous prime is 138393041. The next prime is 138393077. The reversal of 138393065 is 560393831.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 50239744 + 88153321 = 7088^2 + 9389^2 .

It is a cyclic number.

It is not a de Polignac number, because 138393065 - 2²⁴ = 121615849 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13839302 + ... + 13839311.

It is an arithmetic number, because the mean of its divisors is an integer number (41517921).

Almost surely, 2^138393065 is an apocalyptic number.

It is an amenable number.

138393065 is a deficient number, since it is larger than the sum of its proper divisors (27678619).

138393065 is an equidigital number, since it uses as much as digits as its factorization.

138393065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27678618.

The product of its (nonzero) digits is 58320, while the sum is 38.

The square root of 138393065 is about 11764.0581858473. The cubic root of 138393065 is about 517.2550934951.

The spelling of 138393065 in words is "one hundred thirty-eight million, three hundred ninety-three thousand, sixty-five".