138108023 has 2 divisors, whose sum is σ = 138108024. Its totient is φ = 138108022.

The previous prime is 138107999. The next prime is 138108053. The reversal of 138108023 is 320801831.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138108023 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 138107983 and 138108001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138108053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69054011 + 69054012.

It is an arithmetic number, because the mean of its divisors is an integer number (69054012).

Almost surely, 2^138108023 is an apocalyptic number.

138108023 is a deficient number, since it is larger than the sum of its proper divisors (1).

138108023 is an equidigital number, since it uses as much as digits as its factorization.

138108023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 138108023 is about 11751.9369892797. The cubic root of 138108023 is about 516.8997270198.

Adding to 138108023 its reverse (320801831), we get a palindrome (458909854).

The spelling of 138108023 in words is "one hundred thirty-eight million, one hundred eight thousand, twenty-three".