138666304 has 28 divisors (see below), whose sum is σ = 314476384. Its totient is φ = 59428224.

The previous prime is 138666293. The next prime is 138666323. The reversal of 138666304 is 403666831.

It is a tau number, because it is divible by the number of its divisors (28).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 154314 + ... + 155209.

Almost surely, 2^138666304 is an apocalyptic number.

138666304 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

138666304 is an abundant number, since it is smaller than the sum of its proper divisors (175810080).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138666304 is an equidigital number, since it uses as much as digits as its factorization.

138666304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309542 (or 309532 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 37.

The square root of 138666304 is about 11775.6657561261. The cubic root of 138666304 is about 517.5952872060.

The spelling of 138666304 in words is "one hundred thirty-eight million, six hundred sixty-six thousand, three hundred four".