138818423 has 4 divisors (see below), whose sum is σ = 138984720. Its totient is φ = 138652128.

The previous prime is 138818417. The next prime is 138818431. The reversal of 138818423 is 324818831.

138818423 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 138818423 - 2⁶ = 138818359 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 (138818023) 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, 81890 + ... + 83567.

It is an arithmetic number, because the mean of its divisors is an integer number (34746180).

Almost surely, 2^138818423 is an apocalyptic number.

138818423 is a deficient number, since it is larger than the sum of its proper divisors (166297).

138818423 is an equidigital number, since it uses as much as digits as its factorization.

138818423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166296.

The product of its digits is 36864, while the sum is 38.

The square root of 138818423 is about 11782.1230260085. The cubic root of 138818423 is about 517.7844879496.

The spelling of 138818423 in words is "one hundred thirty-eight million, eight hundred eighteen thousand, four hundred twenty-three".