138165679 has 4 divisors (see below), whose sum is σ = 138190720. Its totient is φ = 138140640.

The previous prime is 138165673. The next prime is 138165683. The reversal of 138165679 is 976561831.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138165679 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 (138165673) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 207 + ... + 16624.

It is an arithmetic number, because the mean of its divisors is an integer number (34547680).

Almost surely, 2^138165679 is an apocalyptic number.

138165679 is a deficient number, since it is larger than the sum of its proper divisors (25041).

138165679 is an equidigital number, since it uses as much as digits as its factorization.

138165679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25040.

The product of its digits is 272160, while the sum is 46.

The square root of 138165679 is about 11754.3897757391. The cubic root of 138165679 is about 516.9716471101.

The spelling of 138165679 in words is "one hundred thirty-eight million, one hundred sixty-five thousand, six hundred seventy-nine".