18783563 has 2 divisors, whose sum is σ = 18783564. Its totient is φ = 18783562.

The previous prime is 18783553. The next prime is 18783577. The reversal of 18783563 is 36538781.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18783563 - 2⁸ = 18783307 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18783563.

It is not a weakly prime, because it can be changed into another prime (18783553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9391781 + 9391782.

It is an arithmetic number, because the mean of its divisors is an integer number (9391782).

Almost surely, 2^18783563 is an apocalyptic number.

18783563 is a deficient number, since it is larger than the sum of its proper divisors (1).

18783563 is an equidigital number, since it uses as much as digits as its factorization.

18783563 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120960, while the sum is 41.

The square root of 18783563 is about 4334.0008075680. Note that the first 3 decimals coincide. The cubic root of 18783563 is about 265.8230634052.

The spelling of 18783563 in words is "eighteen million, seven hundred eighty-three thousand, five hundred sixty-three".