18746681 has 4 divisors (see below), whose sum is σ = 18768000. Its totient is φ = 18725364.

The previous prime is 18746671. The next prime is 18746729. The reversal of 18746681 is 18664781.

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 a de Polignac number, because none of the positive numbers 2^k-18746681 is a prime.

It is a super-2 number, since 2×18746681² = 702876097031522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18746641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9281 + ... + 11118.

It is an arithmetic number, because the mean of its divisors is an integer number (4692000).

Almost surely, 2^18746681 is an apocalyptic number.

It is an amenable number.

18746681 is a deficient number, since it is larger than the sum of its proper divisors (21319).

18746681 is an equidigital number, since it uses as much as digits as its factorization.

18746681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21318.

The product of its digits is 64512, while the sum is 41.

The square root of 18746681 is about 4329.7437568521. The cubic root of 18746681 is about 265.6489659760.

The spelling of 18746681 in words is "eighteen million, seven hundred forty-six thousand, six hundred eighty-one".