138817873 has 2 divisors, whose sum is σ = 138817874. Its totient is φ = 138817872.

The previous prime is 138817859. The next prime is 138817897. The reversal of 138817873 is 378718831.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 133356304 + 5461569 = 11548^2 + 2337^2 .

It is a cyclic number.

It is not a de Polignac number, because 138817873 - 2⁹ = 138817361 is a prime.

It is not a weakly prime, because it can be changed into another prime (138817813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69408936 + 69408937.

It is an arithmetic number, because the mean of its divisors is an integer number (69408937).

Almost surely, 2^138817873 is an apocalyptic number.

It is an amenable number.

138817873 is a deficient number, since it is larger than the sum of its proper divisors (1).

138817873 is an equidigital number, since it uses as much as digits as its factorization.

138817873 is an evil number, because the sum of its binary digits is even.

The product of its digits is 225792, while the sum is 46.

The square root of 138817873 is about 11782.0996855399. The cubic root of 138817873 is about 517.7838041263.

The spelling of 138817873 in words is "one hundred thirty-eight million, eight hundred seventeen thousand, eight hundred seventy-three".