18944147 has 2 divisors, whose sum is σ = 18944148. Its totient is φ = 18944146.

The previous prime is 18944141. The next prime is 18944201. The reversal of 18944147 is 74144981.

It is a weak prime.

It is an emirp because it is prime and its reverse (74144981) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18944147 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18944147.

It is not a weakly prime, because it can be changed into another prime (18944141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9472073 + 9472074.

It is an arithmetic number, because the mean of its divisors is an integer number (9472074).

Almost surely, 2^18944147 is an apocalyptic number.

18944147 is a deficient number, since it is larger than the sum of its proper divisors (1).

18944147 is an equidigital number, since it uses as much as digits as its factorization.

18944147 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32256, while the sum is 38.

The square root of 18944147 is about 4352.4874497234. The cubic root of 18944147 is about 266.5784376522.

It can be divided in two parts, 18944 and 147, that added together give a palindrome (19091).

The spelling of 18944147 in words is "eighteen million, nine hundred forty-four thousand, one hundred forty-seven".