18974743 has 2 divisors, whose sum is σ = 18974744. Its totient is φ = 18974742.

The previous prime is 18974741. The next prime is 18974779. The reversal of 18974743 is 34747981.

It is a weak prime.

It is an emirp because it is prime and its reverse (34747981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18974743 - 2¹ = 18974741 is a prime.

Together with 18974741, 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 18974743.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18974741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9487371 + 9487372.

It is an arithmetic number, because the mean of its divisors is an integer number (9487372).

Almost surely, 2^18974743 is an apocalyptic number.

18974743 is a deficient number, since it is larger than the sum of its proper divisors (1).

18974743 is an equidigital number, since it uses as much as digits as its factorization.

18974743 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 169344, while the sum is 43.

The square root of 18974743 is about 4356.0008034894. Note that the first 3 decimals coincide. The cubic root of 18974743 is about 266.7218741600.

The spelling of 18974743 in words is "eighteen million, nine hundred seventy-four thousand, seven hundred forty-three".