138366506 has 8 divisors (see below), whose sum is σ = 207808740. Its totient is φ = 69096928.

The previous prime is 138366497. The next prime is 138366521. The reversal of 138366506 is 605663831.

138366506 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 117527281 + 20839225 = 10841^2 + 4565^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 138366506.

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, 41141 + ... + 44376.

Almost surely, 2^138366506 is an apocalyptic number.

138366506 is a deficient number, since it is larger than the sum of its proper divisors (69442234).

138366506 is an equidigital number, since it uses as much as digits as its factorization.

138366506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86328.

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

The square root of 138366506 is about 11762.9293120379. The cubic root of 138366506 is about 517.2220025862. Note that the first 3 decimals are identical.

The spelling of 138366506 in words is "one hundred thirty-eight million, three hundred sixty-six thousand, five hundred six".