18934563 has 4 divisors (see below), whose sum is σ = 25246088. Its totient is φ = 12623040.

The previous prime is 18934547. The next prime is 18934607. The reversal of 18934563 is 36543981.

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

It is not a de Polignac number, because 18934563 - 2⁴ = 18934547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18934523) 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, 3155758 + ... + 3155763.

It is an arithmetic number, because the mean of its divisors is an integer number (6311522).

Almost surely, 2^18934563 is an apocalyptic number.

18934563 is a deficient number, since it is larger than the sum of its proper divisors (6311525).

18934563 is an equidigital number, since it uses as much as digits as its factorization.

18934563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6311524.

The product of its digits is 77760, while the sum is 39.

The square root of 18934563 is about 4351.3863308146. The cubic root of 18934563 is about 266.5334753266.

The spelling of 18934563 in words is "eighteen million, nine hundred thirty-four thousand, five hundred sixty-three".