18249643 has 8 divisors (see below), whose sum is σ = 18556928. Its totient is φ = 17945064.

The previous prime is 18249617. The next prime is 18249659. The reversal of 18249643 is 34694281.

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 18249643 - 2⁵ = 18249611 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (18249043) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16246 + ... + 17332.

It is an arithmetic number, because the mean of its divisors is an integer number (2319616).

Almost surely, 2^18249643 is an apocalyptic number.

18249643 is a deficient number, since it is larger than the sum of its proper divisors (307285).

18249643 is a wasteful number, since it uses less digits than its factorization.

18249643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1353.

The product of its digits is 41472, while the sum is 37.

The square root of 18249643 is about 4271.9600887649. The cubic root of 18249643 is about 263.2801546553.

The spelling of 18249643 in words is "eighteen million, two hundred forty-nine thousand, six hundred forty-three".