18889471 has 2 divisors, whose sum is σ = 18889472. Its totient is φ = 18889470.

The previous prime is 18889457. The next prime is 18889483. The reversal of 18889471 is 17498881.

It is a strong prime.

It is an emirp because it is prime and its reverse (17498881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18889471 - 2⁹ = 18888959 is a prime.

It is a super-3 number, since 3×18889471³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18883471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9444735 + 9444736.

It is an arithmetic number, because the mean of its divisors is an integer number (9444736).

Almost surely, 2^18889471 is an apocalyptic number.

18889471 is a deficient number, since it is larger than the sum of its proper divisors (1).

18889471 is an equidigital number, since it uses as much as digits as its factorization.

18889471 is an evil number, because the sum of its binary digits is even.

The product of its digits is 129024, while the sum is 46.

The square root of 18889471 is about 4346.2019051121. The cubic root of 18889471 is about 266.3217270953.

The spelling of 18889471 in words is "eighteen million, eight hundred eighty-nine thousand, four hundred seventy-one".