138545923 has 2 divisors, whose sum is σ = 138545924. Its totient is φ = 138545922.

The previous prime is 138545899. The next prime is 138545933. The reversal of 138545923 is 329545831.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 138545923 - 2⁹ = 138545411 is a prime.

It is not a weakly prime, because it can be changed into another prime (138545933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69272961 + 69272962.

It is an arithmetic number, because the mean of its divisors is an integer number (69272962).

Almost surely, 2^138545923 is an apocalyptic number.

138545923 is a deficient number, since it is larger than the sum of its proper divisors (1).

138545923 is an equidigital number, since it uses as much as digits as its factorization.

138545923 is an evil number, because the sum of its binary digits is even.

The product of its digits is 129600, while the sum is 40.

The square root of 138545923 is about 11770.5532155460. The cubic root of 138545923 is about 517.4454630697.

The spelling of 138545923 in words is "one hundred thirty-eight million, five hundred forty-five thousand, nine hundred twenty-three".