138294857 has 2 divisors, whose sum is σ = 138294858. Its totient is φ = 138294856.

The previous prime is 138294833. The next prime is 138294889. The reversal of 138294857 is 758492831.

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., 137921536 + 373321 = 11744^2 + 611^2 .

It is an emirp because it is prime and its reverse (758492831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138294857 - 2¹⁰ = 138293833 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (138294817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69147428 + 69147429.

It is an arithmetic number, because the mean of its divisors is an integer number (69147429).

Almost surely, 2^138294857 is an apocalyptic number.

It is an amenable number.

138294857 is a deficient number, since it is larger than the sum of its proper divisors (1).

138294857 is an equidigital number, since it uses as much as digits as its factorization.

138294857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 483840, while the sum is 47.

The square root of 138294857 is about 11759.8833752721. The cubic root of 138294857 is about 517.1327111367.

The spelling of 138294857 in words is "one hundred thirty-eight million, two hundred ninety-four thousand, eight hundred fifty-seven".