138660023 has 8 divisors (see below), whose sum is σ = 139834800. Its totient is φ = 137490048.

The previous prime is 138660013. The next prime is 138660037. The reversal of 138660023 is 320066831.

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 138660023 - 2⁶ = 138659959 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138660013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76613 + ... + 78401.

It is an arithmetic number, because the mean of its divisors is an integer number (17479350).

Almost surely, 2^138660023 is an apocalyptic number.

138660023 is a deficient number, since it is larger than the sum of its proper divisors (1174777).

138660023 is a wasteful number, since it uses less digits than its factorization.

138660023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2401.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 138660023 is about 11775.3990590553. The cubic root of 138660023 is about 517.5874721253.

The spelling of 138660023 in words is "one hundred thirty-eight million, six hundred sixty thousand, twenty-three".