138806699 has 4 divisors (see below), whose sum is σ = 139280736. Its totient is φ = 138332664.

The previous prime is 138806687. The next prime is 138806741. The reversal of 138806699 is 996608831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 996608831 = 131 ⋅7607701.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138806699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138806299) 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 3 ways as a sum of consecutive naturals, for example, 236579 + ... + 237164.

It is an arithmetic number, because the mean of its divisors is an integer number (34820184).

Almost surely, 2^138806699 is an apocalyptic number.

138806699 is a deficient number, since it is larger than the sum of its proper divisors (474037).

138806699 is an equidigital number, since it uses as much as digits as its factorization.

138806699 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 474036.

The product of its (nonzero) digits is 559872, while the sum is 50.

The square root of 138806699 is about 11781.6254820801. The cubic root of 138806699 is about 517.7699109309.

The spelling of 138806699 in words is "one hundred thirty-eight million, eight hundred six thousand, six hundred ninety-nine".