18122947 has 2 divisors, whose sum is σ = 18122948. Its totient is φ = 18122946.

The previous prime is 18122927. The next prime is 18122989. The reversal of 18122947 is 74922181.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18122947 - 2¹¹ = 18120899 is a prime.

It is not a weakly prime, because it can be changed into another prime (18122927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9061473 + 9061474.

It is an arithmetic number, because the mean of its divisors is an integer number (9061474).

Almost surely, 2^18122947 is an apocalyptic number.

18122947 is a deficient number, since it is larger than the sum of its proper divisors (1).

18122947 is an equidigital number, since it uses as much as digits as its factorization.

18122947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8064, while the sum is 34.

The square root of 18122947 is about 4257.1054720314. The cubic root of 18122947 is about 262.6694754424.

The spelling of 18122947 in words is "eighteen million, one hundred twenty-two thousand, nine hundred forty-seven".