18856841 has 2 divisors, whose sum is σ = 18856842. Its totient is φ = 18856840.

The previous prime is 18856829. The next prime is 18856867. The reversal of 18856841 is 14865881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18361225 + 495616 = 4285^2 + 704^2 .

It is a cyclic number.

It is not a de Polignac number, because 18856841 - 2⁶ = 18856777 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18856141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9428420 + 9428421.

It is an arithmetic number, because the mean of its divisors is an integer number (9428421).

Almost surely, 2^18856841 is an apocalyptic number.

It is an amenable number.

18856841 is a deficient number, since it is larger than the sum of its proper divisors (1).

18856841 is an equidigital number, since it uses as much as digits as its factorization.

18856841 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 61440, while the sum is 41.

The square root of 18856841 is about 4342.4464302971. The cubic root of 18856841 is about 266.1682891199.

The spelling of 18856841 in words is "eighteen million, eight hundred fifty-six thousand, eight hundred forty-one".