18744681 has 16 divisors (see below), whose sum is σ = 26221824. Its totient is φ = 11896704.

The previous prime is 18744641. The next prime is 18744683. The reversal of 18744681 is 18644781.

It is not a de Polignac number, because 18744681 - 2¹⁸ = 18482537 is a prime.

It is a super-2 number, since 2×18744681² = 702726131583522, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18744683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3421 + ... + 7013.

It is an arithmetic number, because the mean of its divisors is an integer number (1638864).

Almost surely, 2^18744681 is an apocalyptic number.

It is an amenable number.

18744681 is a deficient number, since it is larger than the sum of its proper divisors (7477143).

18744681 is a wasteful number, since it uses less digits than its factorization.

18744681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3680.

The product of its digits is 43008, while the sum is 39.

The square root of 18744681 is about 4329.5127901416. The cubic root of 18744681 is about 265.6395186712.

It can be divided in two parts, 1874 and 4681, that added together give a triangular number (6555 = T₁₁₄).

The spelling of 18744681 in words is "eighteen million, seven hundred forty-four thousand, six hundred eighty-one".