138965817 has 8 divisors (see below), whose sum is σ = 185442496. Its totient is φ = 92566512.

The previous prime is 138965797. The next prime is 138965831. The reversal of 138965817 is 718569831.

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

It is not a de Polignac number, because 138965817 - 2⁷ = 138965689 is a prime.

It is a super-2 number, since 2×138965817² = 38622996588954978, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138965857) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15013 + ... + 22434.

It is an arithmetic number, because the mean of its divisors is an integer number (23180312).

Almost surely, 2^138965817 is an apocalyptic number.

It is an amenable number.

138965817 is a deficient number, since it is larger than the sum of its proper divisors (46476679).

138965817 is a wasteful number, since it uses less digits than its factorization.

138965817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38687.

The product of its digits is 362880, while the sum is 48.

The square root of 138965817 is about 11788.3763513047. The cubic root of 138965817 is about 517.9676800892.

The spelling of 138965817 in words is "one hundred thirty-eight million, nine hundred sixty-five thousand, eight hundred seventeen".