18653963 has 2 divisors, whose sum is σ = 18653964. Its totient is φ = 18653962.

The previous prime is 18653923. The next prime is 18653969. The reversal of 18653963 is 36935681.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18653963 - 2⁸ = 18653707 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18653963.

It is not a weakly prime, because it can be changed into another prime (18653969) 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 as a sum of consecutive naturals, namely, 9326981 + 9326982.

It is an arithmetic number, because the mean of its divisors is an integer number (9326982).

Almost surely, 2^18653963 is an apocalyptic number.

18653963 is a deficient number, since it is larger than the sum of its proper divisors (1).

18653963 is an equidigital number, since it uses as much as digits as its factorization.

18653963 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 116640, while the sum is 41.

The square root of 18653963 is about 4319.0233849795. The cubic root of 18653963 is about 265.2102899457.

The spelling of 18653963 in words is "eighteen million, six hundred fifty-three thousand, nine hundred sixty-three".