18012947 has 2 divisors, whose sum is σ = 18012948. Its totient is φ = 18012946.

The previous prime is 18012919. The next prime is 18012961. The reversal of 18012947 is 74921081.

It is a strong prime.

It is an emirp because it is prime and its reverse (74921081) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18012947 - 2⁸ = 18012691 is a prime.

It is not a weakly prime, because it can be changed into another prime (18012047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9006473 + 9006474.

It is an arithmetic number, because the mean of its divisors is an integer number (9006474).

Almost surely, 2^18012947 is an apocalyptic number.

18012947 is a deficient number, since it is larger than the sum of its proper divisors (1).

18012947 is an equidigital number, since it uses as much as digits as its factorization.

18012947 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 18012947 is about 4244.1662314287. The cubic root of 18012947 is about 262.1369590632.

The spelling of 18012947 in words is "eighteen million, twelve thousand, nine hundred forty-seven".