18008963 has 16 divisors (see below), whose sum is σ = 21288960. Its totient is φ = 14913600.

The previous prime is 18008917. The next prime is 18008989. The reversal of 18008963 is 36980081.

It is a cyclic number.

It is not a de Polignac number, because 18008963 - 2¹⁰ = 18007939 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18008993) 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, 37358 + ... + 37836.

It is an arithmetic number, because the mean of its divisors is an integer number (1330560).

Almost surely, 2^18008963 is an apocalyptic number.

18008963 is a deficient number, since it is larger than the sum of its proper divisors (3279997).

18008963 is a wasteful number, since it uses less digits than its factorization.

18008963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 658.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 18008963 is about 4243.6968553373. The cubic root of 18008963 is about 262.1176316567.

The spelling of 18008963 in words is "eighteen million, eight thousand, nine hundred sixty-three".