138776799 has 8 divisors (see below), whose sum is σ = 211469440. Its totient is φ = 79301016.

The previous prime is 138776789. The next prime is 138776819. The reversal of 138776799 is 997677831.

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

It is not a de Polignac number, because 138776799 - 2⁴ = 138776783 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138776719) 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, 3304189 + ... + 3304230.

It is an arithmetic number, because the mean of its divisors is an integer number (26433680).

Almost surely, 2^138776799 is an apocalyptic number.

138776799 is a deficient number, since it is larger than the sum of its proper divisors (72692641).

138776799 is an equidigital number, since it uses as much as digits as its factorization.

138776799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6608429.

The product of its digits is 4000752, while the sum is 57.

The square root of 138776799 is about 11780.3564886637. The cubic root of 138776799 is about 517.7327310922.

The spelling of 138776799 in words is "one hundred thirty-eight million, seven hundred seventy-six thousand, seven hundred ninety-nine".