18948823 has 2 divisors, whose sum is σ = 18948824. Its totient is φ = 18948822.

The previous prime is 18948821. The next prime is 18948827. The reversal of 18948823 is 32884981.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18948823 - 2¹ = 18948821 is a prime.

Together with 18948821, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 18948823.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18948821) 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, 9474411 + 9474412.

It is an arithmetic number, because the mean of its divisors is an integer number (9474412).

Almost surely, 2^18948823 is an apocalyptic number.

18948823 is a deficient number, since it is larger than the sum of its proper divisors (1).

18948823 is an equidigital number, since it uses as much as digits as its factorization.

18948823 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 110592, while the sum is 43.

The square root of 18948823 is about 4353.0245806795. The cubic root of 18948823 is about 266.6003691090.

The spelling of 18948823 in words is "eighteen million, nine hundred forty-eight thousand, eight hundred twenty-three".