138618023 has 2 divisors, whose sum is σ = 138618024. Its totient is φ = 138618022.

The previous prime is 138617989. The next prime is 138618031. The reversal of 138618023 is 320816831.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 138618023 - 2²⁶ = 71509159 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138618083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69309011 + 69309012.

It is an arithmetic number, because the mean of its divisors is an integer number (69309012).

Almost surely, 2^138618023 is an apocalyptic number.

138618023 is a deficient number, since it is larger than the sum of its proper divisors (1).

138618023 is an equidigital number, since it uses as much as digits as its factorization.

138618023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 138618023 is about 11773.6155449378. The cubic root of 138618023 is about 517.5352079168.

The spelling of 138618023 in words is "one hundred thirty-eight million, six hundred eighteen thousand, twenty-three".