18397471 has 2 divisors, whose sum is σ = 18397472. Its totient is φ = 18397470.

The previous prime is 18397459. The next prime is 18397481. The reversal of 18397471 is 17479381.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18397471 - 2¹⁷ = 18266399 is a prime.

It is a super-3 number, since 3×18397471³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18397411) 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, 9198735 + 9198736.

It is an arithmetic number, because the mean of its divisors is an integer number (9198736).

Almost surely, 2^18397471 is an apocalyptic number.

18397471 is a deficient number, since it is larger than the sum of its proper divisors (1).

18397471 is an equidigital number, since it uses as much as digits as its factorization.

18397471 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 42336, while the sum is 40.

The square root of 18397471 is about 4289.2273196929. The cubic root of 18397471 is about 263.9891285315.

The spelling of 18397471 in words is "eighteen million, three hundred ninety-seven thousand, four hundred seventy-one".