18947363 has 2 divisors, whose sum is σ = 18947364. Its totient is φ = 18947362.

The previous prime is 18947359. The next prime is 18947419. The reversal of 18947363 is 36374981.

It is a weak prime.

It is an emirp because it is prime and its reverse (36374981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18947363 - 2² = 18947359 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18947363.

It is not a weakly prime, because it can be changed into another prime (18947963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9473681 + 9473682.

It is an arithmetic number, because the mean of its divisors is an integer number (9473682).

Almost surely, 2^18947363 is an apocalyptic number.

18947363 is a deficient number, since it is larger than the sum of its proper divisors (1).

18947363 is an equidigital number, since it uses as much as digits as its factorization.

18947363 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 41.

The square root of 18947363 is about 4352.8568779596. The cubic root of 18947363 is about 266.5935217790.

The spelling of 18947363 in words is "eighteen million, nine hundred forty-seven thousand, three hundred sixty-three".