18889487 has 2 divisors, whose sum is σ = 18889488. Its totient is φ = 18889486.

The previous prime is 18889483. The next prime is 18889517. The reversal of 18889487 is 78498881.

It is a weak prime.

It is an emirp because it is prime and its reverse (78498881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18889487 - 2² = 18889483 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18889483) 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, 9444743 + 9444744.

It is an arithmetic number, because the mean of its divisors is an integer number (9444744).

Almost surely, 2^18889487 is an apocalyptic number.

18889487 is a deficient number, since it is larger than the sum of its proper divisors (1).

18889487 is an equidigital number, since it uses as much as digits as its factorization.

18889487 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1032192, while the sum is 53.

The square root of 18889487 is about 4346.2037457993. The cubic root of 18889487 is about 266.3218022896.

The spelling of 18889487 in words is "eighteen million, eight hundred eighty-nine thousand, four hundred eighty-seven".