18349663 has 4 divisors (see below), whose sum is σ = 18982440. Its totient is φ = 17716888.

The previous prime is 18349657. The next prime is 18349679. The reversal of 18349663 is 36694381.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18349663 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18349063) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 316345 + ... + 316402.

It is an arithmetic number, because the mean of its divisors is an integer number (4745610).

Almost surely, 2^18349663 is an apocalyptic number.

18349663 is a deficient number, since it is larger than the sum of its proper divisors (632777).

18349663 is an equidigital number, since it uses as much as digits as its factorization.

18349663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 632776.

The product of its digits is 93312, while the sum is 40.

The square root of 18349663 is about 4283.6506626941. The cubic root of 18349663 is about 263.7602612002.

The spelling of 18349663 in words is "eighteen million, three hundred forty-nine thousand, six hundred sixty-three".