18240663 has 8 divisors (see below), whose sum is σ = 27795328. Its totient is φ = 10423224.

The previous prime is 18240659. The next prime is 18240689. The reversal of 18240663 is 36604281.

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

It is not a de Polignac number, because 18240663 - 2² = 18240659 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18240663.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18240463) 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, 434281 + ... + 434322.

It is an arithmetic number, because the mean of its divisors is an integer number (3474416).

Almost surely, 2^18240663 is an apocalyptic number.

18240663 is a deficient number, since it is larger than the sum of its proper divisors (9554665).

18240663 is an equidigital number, since it uses as much as digits as its factorization.

18240663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 868613.

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 18240663 is about 4270.9089196563. The cubic root of 18240663 is about 263.2369639715.

The spelling of 18240663 in words is "eighteen million, two hundred forty thousand, six hundred sixty-three".