18427417 has 2 divisors, whose sum is σ = 18427418. Its totient is φ = 18427416.

The previous prime is 18427403. The next prime is 18427427. The reversal of 18427417 is 71472481.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16941456 + 1485961 = 4116^2 + 1219^2 .

It is an emirp because it is prime and its reverse (71472481) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18427417 is a prime.

It is equal to p_1176856 and since 18427417 and 1176856 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (18427427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9213708 + 9213709.

It is an arithmetic number, because the mean of its divisors is an integer number (9213709).

Almost surely, 2^18427417 is an apocalyptic number.

It is an amenable number.

18427417 is a deficient number, since it is larger than the sum of its proper divisors (1).

18427417 is an equidigital number, since it uses as much as digits as its factorization.

18427417 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12544, while the sum is 34.

The square root of 18427417 is about 4292.7167388497. The cubic root of 18427417 is about 264.1322846758.

Adding to 18427417 its reverse (71472481), we get a palindrome (89899898).

The spelling of 18427417 in words is "eighteen million, four hundred twenty-seven thousand, four hundred seventeen".