18894947 has 2 divisors, whose sum is σ = 18894948. Its totient is φ = 18894946.

The previous prime is 18894923. The next prime is 18894959. The reversal of 18894947 is 74949881.

It is a strong prime.

It is an emirp because it is prime and its reverse (74949881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18894947 - 2²⁰ = 17846371 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 18894895 and 18894904.

It is not a weakly prime, because it can be changed into another prime (18894917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9447473 + 9447474.

It is an arithmetic number, because the mean of its divisors is an integer number (9447474).

Almost surely, 2^18894947 is an apocalyptic number.

18894947 is a deficient number, since it is larger than the sum of its proper divisors (1).

18894947 is an equidigital number, since it uses as much as digits as its factorization.

18894947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 580608, while the sum is 50.

The square root of 18894947 is about 4346.8318347965. The cubic root of 18894947 is about 266.3474598941.

The spelling of 18894947 in words is "eighteen million, eight hundred ninety-four thousand, nine hundred forty-seven".