18986243 has 8 divisors (see below), whose sum is σ = 19420128. Its totient is φ = 18555264.

The previous prime is 18986237. The next prime is 18986249. The reversal of 18986243 is 34268981.

It is an interprime number because it is at equal distance from previous prime (18986237) and next prime (18986249).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18986243 - 2⁸ = 18985987 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 18986243.

It is not an unprimeable number, because it can be changed into a prime (18986249) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17330 + ... + 18392.

It is an arithmetic number, because the mean of its divisors is an integer number (2427516).

Almost surely, 2^18986243 is an apocalyptic number.

18986243 is a deficient number, since it is larger than the sum of its proper divisors (433885).

18986243 is a wasteful number, since it uses less digits than its factorization.

18986243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1453.

The product of its digits is 82944, while the sum is 41.

The square root of 18986243 is about 4357.3206216665. The cubic root of 18986243 is about 266.7757472146.

The spelling of 18986243 in words is "eighteen million, nine hundred eighty-six thousand, two hundred forty-three".