138557065 has 8 divisors (see below), whose sum is σ = 166347720. Its totient is φ = 110792832.

The previous prime is 138557039. The next prime is 138557071. The reversal of 138557065 is 560755831.

It can be written as a sum of positive squares in 4 ways, for example, as 24088464 + 114468601 = 4908^2 + 10699^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 138557065 - 2⁷ = 138556937 is a prime.

It is a super-2 number, since 2×138557065² = 38396120522828450, which contains 22 as substring.

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, 7791 + ... + 18379.

It is an arithmetic number, because the mean of its divisors is an integer number (20793465).

Almost surely, 2^138557065 is an apocalyptic number.

It is an amenable number.

138557065 is a deficient number, since it is larger than the sum of its proper divisors (27790655).

138557065 is a wasteful number, since it uses less digits than its factorization.

138557065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13211.

The product of its (nonzero) digits is 126000, while the sum is 40.

The square root of 138557065 is about 11771.0265057895. The cubic root of 138557065 is about 517.4593338563.

The spelling of 138557065 in words is "one hundred thirty-eight million, five hundred fifty-seven thousand, sixty-five".