18386641 has 16 divisors (see below), whose sum is σ = 22873984. Its totient is φ = 14390784.

The previous prime is 18386617. The next prime is 18386647. The reversal of 18386641 is 14668381.

It is a cyclic number.

It is not a de Polignac number, because 18386641 - 2⁷ = 18386513 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18386641.

It is not an unprimeable number, because it can be changed into a prime (18386647) 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, 7786 + ... + 9868.

It is an arithmetic number, because the mean of its divisors is an integer number (1429624).

Almost surely, 2^18386641 is an apocalyptic number.

It is an amenable number.

18386641 is a deficient number, since it is larger than the sum of its proper divisors (4487343).

18386641 is a wasteful number, since it uses less digits than its factorization.

18386641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2200.

The product of its digits is 27648, while the sum is 37.

The square root of 18386641 is about 4287.9646686977. The cubic root of 18386641 is about 263.9373177247.

The spelling of 18386641 in words is "eighteen million, three hundred eighty-six thousand, six hundred forty-one".