18986841 has 12 divisors (see below), whose sum is σ = 29038932. Its totient is φ = 11913216.

The previous prime is 18986839. The next prime is 18986857. The reversal of 18986841 is 14868981.

It can be written as a sum of positive squares in 2 ways, for example, as 8874441 + 10112400 = 2979^2 + 3180^2 .

It is not a de Polignac number, because 18986841 - 2¹ = 18986839 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18986801) 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 in 11 ways as a sum of consecutive naturals, for example, 61896 + ... + 62201.

It is an arithmetic number, because the mean of its divisors is an integer number (2419911).

Almost surely, 2^18986841 is an apocalyptic number.

It is an amenable number.

18986841 is a deficient number, since it is larger than the sum of its proper divisors (10052091).

18986841 is a wasteful number, since it uses less digits than its factorization.

18986841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124120 (or 124117 counting only the distinct ones).

The product of its digits is 110592, while the sum is 45.

The square root of 18986841 is about 4357.3892412774. The cubic root of 18986841 is about 266.7785480183.

The spelling of 18986841 in words is "eighteen million, nine hundred eighty-six thousand, eight hundred forty-one".