138358273 has 2 divisors, whose sum is σ = 138358274. Its totient is φ = 138358272.

The previous prime is 138358211. The next prime is 138358289. The reversal of 138358273 is 372853831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 114318864 + 24039409 = 10692^2 + 4903^2 .

It is a cyclic number.

It is not a de Polignac number, because 138358273 - 2²⁵ = 104803841 is a prime.

It is not a weakly prime, because it can be changed into another prime (138358373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69179136 + 69179137.

It is an arithmetic number, because the mean of its divisors is an integer number (69179137).

Almost surely, 2^138358273 is an apocalyptic number.

It is an amenable number.

138358273 is a deficient number, since it is larger than the sum of its proper divisors (1).

138358273 is an equidigital number, since it uses as much as digits as its factorization.

138358273 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120960, while the sum is 40.

The square root of 138358273 is about 11762.5793514858. The cubic root of 138358273 is about 517.2117439060.

The spelling of 138358273 in words is "one hundred thirty-eight million, three hundred fifty-eight thousand, two hundred seventy-three".