138764123 has 4 divisors (see below), whose sum is σ = 141382368. Its totient is φ = 136145880.

The previous prime is 138764111. The next prime is 138764161. The reversal of 138764123 is 321467831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 321467831 = 17327 ⋅18553.

It is a cyclic number.

It is not a de Polignac number, because 138764123 - 2²² = 134569819 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138764173) 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, 1309043 + ... + 1309148.

It is an arithmetic number, because the mean of its divisors is an integer number (35345592).

Almost surely, 2^138764123 is an apocalyptic number.

138764123 is a deficient number, since it is larger than the sum of its proper divisors (2618245).

138764123 is an equidigital number, since it uses as much as digits as its factorization.

138764123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2618244.

The product of its digits is 24192, while the sum is 35.

The square root of 138764123 is about 11779.8184620986. The cubic root of 138764123 is about 517.7169672182.

The spelling of 138764123 in words is "one hundred thirty-eight million, seven hundred sixty-four thousand, one hundred twenty-three".