123489857 has 2 divisors, whose sum is σ = 123489858. Its totient is φ = 123489856.

The previous prime is 123489791. The next prime is 123489913. The reversal of 123489857 is 758984321.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 113018161 + 10471696 = 10631^2 + 3236^2 .

It is an emirp because it is prime and its reverse (758984321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 123489857 - 2¹⁶ = 123424321 is a prime.

It is not a weakly prime, because it can be changed into another prime (123489557) 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, 61744928 + 61744929.

It is an arithmetic number, because the mean of its divisors is an integer number (61744929).

Almost surely, 2^123489857 is an apocalyptic number.

It is an amenable number.

123489857 is a deficient number, since it is larger than the sum of its proper divisors (1).

123489857 is an equidigital number, since it uses as much as digits as its factorization.

123489857 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 123489857 is about 11112.5990209312. The cubic root of 123489857 is about 497.9783125774.

The spelling of 123489857 in words is "one hundred twenty-three million, four hundred eighty-nine thousand, eight hundred fifty-seven".