18680047 has 2 divisors, whose sum is σ = 18680048. Its totient is φ = 18680046.

The previous prime is 18680033. The next prime is 18680083. The reversal of 18680047 is 74008681.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (74008681) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18680047 - 2⁷ = 18679919 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18679994 and 18680021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18680027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9340023 + 9340024.

It is an arithmetic number, because the mean of its divisors is an integer number (9340024).

Almost surely, 2^18680047 is an apocalyptic number.

18680047 is a deficient number, since it is larger than the sum of its proper divisors (1).

18680047 is an equidigital number, since it uses as much as digits as its factorization.

18680047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10752, while the sum is 34.

The square root of 18680047 is about 4322.0419942430. The cubic root of 18680047 is about 265.3338476642. Note that the first 3 decimals are identical.

The spelling of 18680047 in words is "eighteen million, six hundred eighty thousand, forty-seven".