18678963 has 4 divisors (see below), whose sum is σ = 24905288. Its totient is φ = 12452640.

The previous prime is 18678931. The next prime is 18678973. The reversal of 18678963 is 36987681.

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

It is not a de Polignac number, because 18678963 - 2⁵ = 18678931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18678973) 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 3 ways as a sum of consecutive naturals, for example, 3113158 + ... + 3113163.

It is an arithmetic number, because the mean of its divisors is an integer number (6226322).

Almost surely, 2^18678963 is an apocalyptic number.

18678963 is a deficient number, since it is larger than the sum of its proper divisors (6226325).

18678963 is an equidigital number, since it uses as much as digits as its factorization.

18678963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6226324.

The product of its digits is 435456, while the sum is 48.

The square root of 18678963 is about 4321.9165887370. The cubic root of 18678963 is about 265.3287151387.

The spelling of 18678963 in words is "eighteen million, six hundred seventy-eight thousand, nine hundred sixty-three".