18988471 has 2 divisors, whose sum is σ = 18988472. Its totient is φ = 18988470.

The previous prime is 18988421. The next prime is 18988483. The reversal of 18988471 is 17488981.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18988471 - 2⁹ = 18987959 is a prime.

It is a super-3 number, since 3×18988471³ (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 (18988421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9494235 + 9494236.

It is an arithmetic number, because the mean of its divisors is an integer number (9494236).

Almost surely, 2^18988471 is an apocalyptic number.

18988471 is a deficient number, since it is larger than the sum of its proper divisors (1).

18988471 is an equidigital number, since it uses as much as digits as its factorization.

18988471 is an odious number, because the sum of its binary digits is odd.

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

The square root of 18988471 is about 4357.5762758671. The cubic root of 18988471 is about 266.7861820176.

The spelling of 18988471 in words is "eighteen million, nine hundred eighty-eight thousand, four hundred seventy-one".