18982287 has 12 divisors (see below), whose sum is σ = 27487824. Its totient is φ = 12623040.

The previous prime is 18982283. The next prime is 18982297. The reversal of 18982287 is 78228981.

It is a happy number.

It is not a de Polignac number, because 18982287 - 2² = 18982283 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18982283) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1462 + ... + 6332.

It is an arithmetic number, because the mean of its divisors is an integer number (2290652).

Almost surely, 2^18982287 is an apocalyptic number.

18982287 is a deficient number, since it is larger than the sum of its proper divisors (8505537).

18982287 is a wasteful number, since it uses less digits than its factorization.

18982287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5310 (or 5307 counting only the distinct ones).

The product of its digits is 129024, while the sum is 45.

The square root of 18982287 is about 4356.8666493249. The cubic root of 18982287 is about 266.7572173390.

The spelling of 18982287 in words is "eighteen million, nine hundred eighty-two thousand, two hundred eighty-seven".