138590665 has 8 divisors (see below), whose sum is σ = 167000328. Its totient is φ = 110411520.

The previous prime is 138590659. The next prime is 138590687. The reversal of 138590665 is 566095831.

It can be written as a sum of positive squares in 4 ways, for example, as 62220544 + 76370121 = 7888^2 + 8739^2 .

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

It is not a de Polignac number, because 138590665 - 2³ = 138590657 is a prime.

It is a Duffinian number.

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, 56302 + ... + 58711.

It is an arithmetic number, because the mean of its divisors is an integer number (20875041).

Almost surely, 2^138590665 is an apocalyptic number.

It is an amenable number.

138590665 is a deficient number, since it is larger than the sum of its proper divisors (28409663).

138590665 is a wasteful number, since it uses less digits than its factorization.

138590665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115259.

The product of its (nonzero) digits is 194400, while the sum is 43.

The square root of 138590665 is about 11772.4536524889. The cubic root of 138590665 is about 517.5011583286.

The spelling of 138590665 in words is "one hundred thirty-eight million, five hundred ninety thousand, six hundred sixty-five".