138648965 has 16 divisors (see below), whose sum is σ = 204774528. Its totient is φ = 87759936.

The previous prime is 138648943. The next prime is 138649009. The reversal of 138648965 is 569846831.

It is a cyclic number.

It is not a de Polignac number, because 138648965 - 2¹⁰ = 138647941 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 151907 + ... + 152816.

It is an arithmetic number, because the mean of its divisors is an integer number (12798408).

Almost surely, 2^138648965 is an apocalyptic number.

It is an amenable number.

138648965 is a deficient number, since it is larger than the sum of its proper divisors (66125563).

138648965 is a wasteful number, since it uses less digits than its factorization.

138648965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304748.

The product of its digits is 1244160, while the sum is 50.

The square root of 138648965 is about 11774.9295114663. The cubic root of 138648965 is about 517.5737127295.

The spelling of 138648965 in words is "one hundred thirty-eight million, six hundred forty-eight thousand, nine hundred sixty-five".