138686799 has 8 divisors (see below), whose sum is σ = 195793200. Its totient is φ = 87019136.

The previous prime is 138686797. The next prime is 138686809. The reversal of 138686799 is 997686831.

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 138686799 - 2¹ = 138686797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138686797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1359624 + ... + 1359725.

It is an arithmetic number, because the mean of its divisors is an integer number (24474150).

Almost surely, 2^138686799 is an apocalyptic number.

138686799 is a deficient number, since it is larger than the sum of its proper divisors (57106401).

138686799 is a wasteful number, since it uses less digits than its factorization.

138686799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2719369.

The product of its digits is 3919104, while the sum is 57.

The square root of 138686799 is about 11776.5359507794. The cubic root of 138686799 is about 517.6207862940.

The spelling of 138686799 in words is "one hundred thirty-eight million, six hundred eighty-six thousand, seven hundred ninety-nine".