138579823 has 2 divisors, whose sum is σ = 138579824. Its totient is φ = 138579822.

The previous prime is 138579781. The next prime is 138579851. The reversal of 138579823 is 328975831.

138579823 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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138579823 is a prime.

It is a super-2 number, since 2×138579823² = 38408734685422658, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138579523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69289911 + 69289912.

It is an arithmetic number, because the mean of its divisors is an integer number (69289912).

Almost surely, 2^138579823 is an apocalyptic number.

138579823 is a deficient number, since it is larger than the sum of its proper divisors (1).

138579823 is an equidigital number, since it uses as much as digits as its factorization.

138579823 is an evil number, because the sum of its binary digits is even.

The product of its digits is 362880, while the sum is 46.

The square root of 138579823 is about 11771.9931617377. The cubic root of 138579823 is about 517.4876632064.

The spelling of 138579823 in words is "one hundred thirty-eight million, five hundred seventy-nine thousand, eight hundred twenty-three".