138065823 has 64 divisors (see below), whose sum is σ = 250629120. Its totient is φ = 73322496.

The previous prime is 138065821. The next prime is 138065827. The reversal of 138065823 is 328560831.

It is not a de Polignac number, because 138065823 - 2¹ = 138065821 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138065821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 311440 + ... + 311882.

It is an arithmetic number, because the mean of its divisors is an integer number (3916080).

Almost surely, 2^138065823 is an apocalyptic number.

138065823 is a deficient number, since it is larger than the sum of its proper divisors (112563297).

138065823 is a wasteful number, since it uses less digits than its factorization.

138065823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 573 (or 567 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 138065823 is about 11750.1414034045. The cubic root of 138065823 is about 516.8470740551.

The spelling of 138065823 in words is "one hundred thirty-eight million, sixty-five thousand, eight hundred twenty-three".