18748913 has 2 divisors, whose sum is σ = 18748914. Its totient is φ = 18748912.

The previous prime is 18748907. The next prime is 18748937. The reversal of 18748913 is 31984781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10975969 + 7772944 = 3313^2 + 2788^2 .

It is a cyclic number.

It is not a de Polignac number, because 18748913 - 2²² = 14554609 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (18748963) 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 as a sum of consecutive naturals, namely, 9374456 + 9374457.

It is an arithmetic number, because the mean of its divisors is an integer number (9374457).

Almost surely, 2^18748913 is an apocalyptic number.

It is an amenable number.

18748913 is a deficient number, since it is larger than the sum of its proper divisors (1).

18748913 is an equidigital number, since it uses as much as digits as its factorization.

18748913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 41.

The square root of 18748913 is about 4330.0015011545. The cubic root of 18748913 is about 265.6595083748.

The spelling of 18748913 in words is "eighteen million, seven hundred forty-eight thousand, nine hundred thirteen".