138530666 has 16 divisors (see below), whose sum is σ = 210513600. Its totient is φ = 68365440.

The previous prime is 138530659. The next prime is 138530669. The reversal of 138530666 is 666035831.

It is not an unprimeable number, because it can be changed into a prime (138530669) 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, 50810 + ... + 53466.

It is an arithmetic number, because the mean of its divisors is an integer number (13157100).

Almost surely, 2^138530666 is an apocalyptic number.

138530666 is a deficient number, since it is larger than the sum of its proper divisors (71982934).

138530666 is a wasteful number, since it uses less digits than its factorization.

138530666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2989.

The product of its (nonzero) digits is 77760, while the sum is 38.

The square root of 138530666 is about 11769.9050973234. The cubic root of 138530666 is about 517.4264682722.

The spelling of 138530666 in words is "one hundred thirty-eight million, five hundred thirty thousand, six hundred sixty-six".