18338963 has 4 divisors (see below), whose sum is σ = 18349800. Its totient is φ = 18328128.

The previous prime is 18338951. The next prime is 18338989. The reversal of 18338963 is 36983381.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 18338963 - 2¹⁰ = 18337939 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 18338963.

It is not an unprimeable number, because it can be changed into a prime (18338993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2270 + ... + 6467.

It is an arithmetic number, because the mean of its divisors is an integer number (4587450).

Almost surely, 2^18338963 is an apocalyptic number.

18338963 is a deficient number, since it is larger than the sum of its proper divisors (10837).

18338963 is an equidigital number, since it uses as much as digits as its factorization.

18338963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10836.

The product of its digits is 93312, while the sum is 41.

The square root of 18338963 is about 4282.4015458619. The cubic root of 18338963 is about 263.7089835366.

The spelling of 18338963 in words is "eighteen million, three hundred thirty-eight thousand, nine hundred sixty-three".