138809023 has 2 divisors, whose sum is σ = 138809024. Its totient is φ = 138809022.

The previous prime is 138809017. The next prime is 138809057. The reversal of 138809023 is 320908831.

138809023 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (138809057) can be obtained adding 138809023 to its sum of digits (34).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 138809023 - 2⁵ = 138808991 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 138809023.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138809323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69404511 + 69404512.

It is an arithmetic number, because the mean of its divisors is an integer number (69404512).

Almost surely, 2^138809023 is an apocalyptic number.

138809023 is a deficient number, since it is larger than the sum of its proper divisors (1).

138809023 is an equidigital number, since it uses as much as digits as its factorization.

138809023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 138809023 is about 11781.7241098237. The cubic root of 138809023 is about 517.7728005383.

The spelling of 138809023 in words is "one hundred thirty-eight million, eight hundred nine thousand, twenty-three".