138284123 has 4 divisors (see below), whose sum is σ = 139056840. Its totient is φ = 137511408.

The previous prime is 138284117. The next prime is 138284129. The reversal of 138284123 is 321482831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 321482831 = 19 ⋅16920149.

It is an interprime number because it is at equal distance from previous prime (138284117) and next prime (138284129).

It is a cyclic number.

It is not a de Polignac number, because 138284123 - 2¹⁰ = 138283099 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 138284123.

It is not an unprimeable number, because it can be changed into a prime (138284129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 386090 + ... + 386447.

It is an arithmetic number, because the mean of its divisors is an integer number (34764210).

Almost surely, 2^138284123 is an apocalyptic number.

138284123 is a deficient number, since it is larger than the sum of its proper divisors (772717).

138284123 is an equidigital number, since it uses as much as digits as its factorization.

138284123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 772716.

The product of its digits is 9216, while the sum is 32.

The square root of 138284123 is about 11759.4269843390. The cubic root of 138284123 is about 517.1193314005.

The spelling of 138284123 in words is "one hundred thirty-eight million, two hundred eighty-four thousand, one hundred twenty-three".