138186767 has 4 divisors (see below), whose sum is σ = 138379680. Its totient is φ = 137993856.

The previous prime is 138186743. The next prime is 138186773. The reversal of 138186767 is 767681831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 767681831 = 7 ⋅109668833.

It is a cyclic number.

It is not a de Polignac number, because 138186767 - 2⁶ = 138186703 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138186707) 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, 95378 + ... + 96815.

It is an arithmetic number, because the mean of its divisors is an integer number (34594920).

Almost surely, 2^138186767 is an apocalyptic number.

138186767 is a deficient number, since it is larger than the sum of its proper divisors (192913).

138186767 is an equidigital number, since it uses as much as digits as its factorization.

138186767 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192912.

The product of its digits is 338688, while the sum is 47.

The square root of 138186767 is about 11755.2867680886. The cubic root of 138186767 is about 516.9979472824.

The spelling of 138186767 in words is "one hundred thirty-eight million, one hundred eighty-six thousand, seven hundred sixty-seven".