18012047 has 2 divisors, whose sum is σ = 18012048. Its totient is φ = 18012046.

The previous prime is 18012041. The next prime is 18012067. The reversal of 18012047 is 74021081.

It is a weak prime.

It is an emirp because it is prime and its reverse (74021081) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18012047 - 2²² = 13817743 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18012041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9006023 + 9006024.

It is an arithmetic number, because the mean of its divisors is an integer number (9006024).

Almost surely, 2^18012047 is an apocalyptic number.

18012047 is a deficient number, since it is larger than the sum of its proper divisors (1).

18012047 is an equidigital number, since it uses as much as digits as its factorization.

18012047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 18012047 is about 4244.0602022120. The cubic root of 18012047 is about 262.1325931814.

The spelling of 18012047 in words is "eighteen million, twelve thousand, forty-seven".