18386947 has 2 divisors, whose sum is σ = 18386948. Its totient is φ = 18386946.

The previous prime is 18386923. The next prime is 18386969. The reversal of 18386947 is 74968381.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18386947 - 2¹⁵ = 18354179 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18386897 and 18386906.

It is not a weakly prime, because it can be changed into another prime (18386047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9193473 + 9193474.

It is an arithmetic number, because the mean of its divisors is an integer number (9193474).

Almost surely, 2^18386947 is an apocalyptic number.

18386947 is a deficient number, since it is larger than the sum of its proper divisors (1).

18386947 is an equidigital number, since it uses as much as digits as its factorization.

18386947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 290304, while the sum is 46.

The square root of 18386947 is about 4288.0003498134. Note that the first 3 decimals coincide. The cubic root of 18386947 is about 263.9387819104.

The spelling of 18386947 in words is "eighteen million, three hundred eighty-six thousand, nine hundred forty-seven".