138648806 has 8 divisors (see below), whose sum is σ = 208039104. Its totient is φ = 69302440.

The previous prime is 138648779. The next prime is 138648817. The reversal of 138648806 is 608846831.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1430 + ... + 16713.

It is an arithmetic number, because the mean of its divisors is an integer number (26004888).

Almost surely, 2^138648806 is an apocalyptic number.

138648806 is a deficient number, since it is larger than the sum of its proper divisors (69390298).

138648806 is a wasteful number, since it uses less digits than its factorization.

138648806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21966.

The product of its (nonzero) digits is 221184, while the sum is 44.

The square root of 138648806 is about 11774.9227598316. The cubic root of 138648806 is about 517.5735148815.

The spelling of 138648806 in words is "one hundred thirty-eight million, six hundred forty-eight thousand, eight hundred six".