138632423 has 2 divisors, whose sum is σ = 138632424. Its totient is φ = 138632422.

The previous prime is 138632309. The next prime is 138632449. The reversal of 138632423 is 324236831.

138632423 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is an emirp because it is prime and its reverse (324236831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138632423 - 2⁸ = 138632167 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 138632423.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138632023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69316211 + 69316212.

It is an arithmetic number, because the mean of its divisors is an integer number (69316212).

Almost surely, 2^138632423 is an apocalyptic number.

138632423 is a deficient number, since it is larger than the sum of its proper divisors (1).

138632423 is an equidigital number, since it uses as much as digits as its factorization.

138632423 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 32.

The square root of 138632423 is about 11774.2270659267. The cubic root of 138632423 is about 517.5531282631.

The spelling of 138632423 in words is "one hundred thirty-eight million, six hundred thirty-two thousand, four hundred twenty-three".