138356799 has 16 divisors (see below), whose sum is σ = 219996672. Its totient is φ = 75623328.

The previous prime is 138356789. The next prime is 138356821. The reversal of 138356799 is 997653831.

It is not a de Polignac number, because 138356799 - 2⁴ = 138356783 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138356749) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 142744 + ... + 143709.

It is an arithmetic number, because the mean of its divisors is an integer number (13749792).

Almost surely, 2^138356799 is an apocalyptic number.

138356799 is a deficient number, since it is larger than the sum of its proper divisors (81639873).

138356799 is a wasteful number, since it uses less digits than its factorization.

138356799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286486.

The product of its digits is 1224720, while the sum is 51.

The square root of 138356799 is about 11762.5166949935. The cubic root of 138356799 is about 517.2099071942.

The spelling of 138356799 in words is "one hundred thirty-eight million, three hundred fifty-six thousand, seven hundred ninety-nine".