18411947 has 2 divisors, whose sum is σ = 18411948. Its totient is φ = 18411946.

The previous prime is 18411941. The next prime is 18411961. The reversal of 18411947 is 74911481.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18411947 - 2¹⁴ = 18395563 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18411941) 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, 9205973 + 9205974.

It is an arithmetic number, because the mean of its divisors is an integer number (9205974).

Almost surely, 2^18411947 is an apocalyptic number.

18411947 is a deficient number, since it is larger than the sum of its proper divisors (1).

18411947 is an equidigital number, since it uses as much as digits as its factorization.

18411947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8064, while the sum is 35.

The square root of 18411947 is about 4290.9144712986. The cubic root of 18411947 is about 264.0583500883.

The spelling of 18411947 in words is "eighteen million, four hundred eleven thousand, nine hundred forty-seven".