18887243 has 4 divisors (see below), whose sum is σ = 18976968. Its totient is φ = 18797520.

The previous prime is 18887237. The next prime is 18887249. The reversal of 18887243 is 34278881.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (18887237) and next prime (18887249).

It is a cyclic number.

It is not a de Polignac number, because 18887243 - 2⁴ = 18887227 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18887243.

It is not an unprimeable number, because it can be changed into a prime (18887249) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44546 + ... + 44967.

It is an arithmetic number, because the mean of its divisors is an integer number (4744242).

Almost surely, 2^18887243 is an apocalyptic number.

18887243 is a deficient number, since it is larger than the sum of its proper divisors (89725).

18887243 is an equidigital number, since it uses as much as digits as its factorization.

18887243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89724.

The product of its digits is 86016, while the sum is 41.

The square root of 18887243 is about 4345.9455818038. The cubic root of 18887243 is about 266.3112558626.

The spelling of 18887243 in words is "eighteen million, eight hundred eighty-seven thousand, two hundred forty-three".