138808823 has 2 divisors, whose sum is σ = 138808824. Its totient is φ = 138808822.

The previous prime is 138808807. The next prime is 138808883. The reversal of 138808823 is 328808831.

138808823 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 138808823 - 2⁴ = 138808807 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138808883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69404411 + 69404412.

It is an arithmetic number, because the mean of its divisors is an integer number (69404412).

Almost surely, 2^138808823 is an apocalyptic number.

138808823 is a deficient number, since it is larger than the sum of its proper divisors (1).

138808823 is an equidigital number, since it uses as much as digits as its factorization.

138808823 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 73728, while the sum is 41.

The square root of 138808823 is about 11781.7156220985. The cubic root of 138808823 is about 517.7725518642.

The spelling of 138808823 in words is "one hundred thirty-eight million, eight hundred eight thousand, eight hundred twenty-three".