18484681 has 4 divisors (see below), whose sum is σ = 18707472. Its totient is φ = 18261892.

The previous prime is 18484679. The next prime is 18484721. The reversal of 18484681 is 18648481.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18484681 - 2¹ = 18484679 is a prime.

It is a super-2 number, since 2×18484681² = 683366863343522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18484601) 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 3 ways as a sum of consecutive naturals, for example, 111271 + ... + 111436.

It is an arithmetic number, because the mean of its divisors is an integer number (4676868).

Almost surely, 2^18484681 is an apocalyptic number.

It is an amenable number.

18484681 is a deficient number, since it is larger than the sum of its proper divisors (222791).

18484681 is an equidigital number, since it uses as much as digits as its factorization.

18484681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222790.

The product of its digits is 49152, while the sum is 40.

The square root of 18484681 is about 4299.3814671415. The cubic root of 18484681 is about 264.4056026104.

The spelling of 18484681 in words is "eighteen million, four hundred eighty-four thousand, six hundred eighty-one".