18123047 has 2 divisors, whose sum is σ = 18123048. Its totient is φ = 18123046.

The previous prime is 18123043. The next prime is 18123073. The reversal of 18123047 is 74032181.

It is an a-pointer prime, because the next prime (18123073) can be obtained adding 18123047 to its sum of digits (26).

It is a weak prime.

It is an emirp because it is prime and its reverse (74032181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18123047 - 2² = 18123043 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 (18123041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9061523 + 9061524.

It is an arithmetic number, because the mean of its divisors is an integer number (9061524).

Almost surely, 2^18123047 is an apocalyptic number.

18123047 is a deficient number, since it is larger than the sum of its proper divisors (1).

18123047 is an equidigital number, since it uses as much as digits as its factorization.

18123047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 18123047 is about 4257.1172170848. The cubic root of 18123047 is about 262.6699585666.

The spelling of 18123047 in words is "eighteen million, one hundred twenty-three thousand, forty-seven".