123857849 has 2 divisors, whose sum is σ = 123857850. Its totient is φ = 123857848.

The previous prime is 123857819. The next prime is 123857857. The reversal of 123857849 is 948758321.

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., 122500624 + 1357225 = 11068^2 + 1165^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123857849 is a prime.

It is not a weakly prime, because it can be changed into another prime (123857819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61928924 + 61928925.

It is an arithmetic number, because the mean of its divisors is an integer number (61928925).

Almost surely, 2^123857849 is an apocalyptic number.

It is an amenable number.

123857849 is a deficient number, since it is larger than the sum of its proper divisors (1).

123857849 is an equidigital number, since it uses as much as digits as its factorization.

123857849 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 123857849 is about 11129.1441270207. The cubic root of 123857849 is about 498.4724700569.

The spelling of 123857849 in words is "one hundred twenty-three million, eight hundred fifty-seven thousand, eight hundred forty-nine".