138029873 has 2 divisors, whose sum is σ = 138029874. Its totient is φ = 138029872.

The previous prime is 138029809. The next prime is 138029921. The reversal of 138029873 is 378920831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69338929 + 68690944 = 8327^2 + 8288^2 .

It is an emirp because it is prime and its reverse (378920831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138029873 - 2⁶ = 138029809 is a prime.

It is a super-2 number, since 2×138029873² = 38104491680792258, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 138029873.

It is not a weakly prime, because it can be changed into another prime (138029173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69014936 + 69014937.

It is an arithmetic number, because the mean of its divisors is an integer number (69014937).

Almost surely, 2^138029873 is an apocalyptic number.

It is an amenable number.

138029873 is a deficient number, since it is larger than the sum of its proper divisors (1).

138029873 is an equidigital number, since it uses as much as digits as its factorization.

138029873 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 138029873 is about 11748.6115349857. The cubic root of 138029873 is about 516.8022107553.

The spelling of 138029873 in words is "one hundred thirty-eight million, twenty-nine thousand, eight hundred seventy-three".