11999857 has 2 divisors, whose sum is σ = 11999858. Its totient is φ = 11999856.

The previous prime is 11999843. The next prime is 11999879. The reversal of 11999857 is 75899911.

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., 6964321 + 5035536 = 2639^2 + 2244^2 .

It is an emirp because it is prime and its reverse (75899911) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11999857 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11999857.

It is not a weakly prime, because it can be changed into another prime (11999837) 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, 5999928 + 5999929.

It is an arithmetic number, because the mean of its divisors is an integer number (5999929).

Almost surely, 2^11999857 is an apocalyptic number.

It is an amenable number.

11999857 is a deficient number, since it is larger than the sum of its proper divisors (1).

11999857 is an equidigital number, since it uses as much as digits as its factorization.

11999857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 204120, while the sum is 49.

The square root of 11999857 is about 3464.0809748041. The cubic root of 11999857 is about 228.9419390952.

The spelling of 11999857 in words is "eleven million, nine hundred ninety-nine thousand, eight hundred fifty-seven".