18282993 has 8 divisors (see below), whose sum is σ = 24523968. Its totient is φ = 12115344.

The previous prime is 18282989. The next prime is 18283009. The reversal of 18282993 is 39928281.

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

It is not a de Polignac number, because 18282993 - 2² = 18282989 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (18280993) 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, 17746 + ... + 18747.

It is an arithmetic number, because the mean of its divisors is an integer number (3065496).

Almost surely, 2^18282993 is an apocalyptic number.

It is an amenable number.

18282993 is a deficient number, since it is larger than the sum of its proper divisors (6240975).

18282993 is a wasteful number, since it uses less digits than its factorization.

18282993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36663.

The product of its digits is 62208, while the sum is 42.

The square root of 18282993 is about 4275.8616675473. The cubic root of 18282993 is about 263.4404326775.

The spelling of 18282993 in words is "eighteen million, two hundred eighty-two thousand, nine hundred ninety-three".