18853861 has 4 divisors (see below), whose sum is σ = 20304172. Its totient is φ = 17403552.

The previous prime is 18853847. The next prime is 18853873. The reversal of 18853861 is 16835881.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10929636 + 7924225 = 3306^2 + 2815^2 .

It is a cyclic number.

It is not a de Polignac number, because 18853861 - 2⁹ = 18853349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18853811) 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 in 3 ways as a sum of consecutive naturals, for example, 725136 + ... + 725161.

It is an arithmetic number, because the mean of its divisors is an integer number (5076043).

Almost surely, 2^18853861 is an apocalyptic number.

It is an amenable number.

18853861 is a deficient number, since it is larger than the sum of its proper divisors (1450311).

18853861 is a wasteful number, since it uses less digits than its factorization.

18853861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1450310.

The product of its digits is 46080, while the sum is 40.

The square root of 18853861 is about 4342.1032921846. The cubic root of 18853861 is about 266.1542672716.

The spelling of 18853861 in words is "eighteen million, eight hundred fifty-three thousand, eight hundred sixty-one".