18536681 has 8 divisors (see below), whose sum is σ = 19676160. Its totient is φ = 17402688.

The previous prime is 18536677. The next prime is 18536699. The reversal of 18536681 is 18663581.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18536681 - 2² = 18536677 is a prime.

It is a super-2 number, since 2×18536681² = 687217084991522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18536641) 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 7 ways as a sum of consecutive naturals, for example, 7160 + ... + 9398.

It is an arithmetic number, because the mean of its divisors is an integer number (2459520).

Almost surely, 2^18536681 is an apocalyptic number.

It is an amenable number.

18536681 is a deficient number, since it is larger than the sum of its proper divisors (1139479).

18536681 is a wasteful number, since it uses less digits than its factorization.

18536681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2743.

The product of its digits is 34560, while the sum is 38.

The square root of 18536681 is about 4305.4246015927. The cubic root of 18536681 is about 264.6533071599.

The spelling of 18536681 in words is "eighteen million, five hundred thirty-six thousand, six hundred eighty-one".