18428243 has 4 divisors (see below), whose sum is σ = 18436848. Its totient is φ = 18419640.

The previous prime is 18428239. The next prime is 18428269. The reversal of 18428243 is 34282481.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 18428243 - 2² = 18428239 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18428213) 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 in 3 ways as a sum of consecutive naturals, for example, 1730 + ... + 6312.

It is an arithmetic number, because the mean of its divisors is an integer number (4609212).

Almost surely, 2^18428243 is an apocalyptic number.

18428243 is a deficient number, since it is larger than the sum of its proper divisors (8605).

18428243 is an equidigital number, since it uses as much as digits as its factorization.

18428243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8604.

The product of its digits is 12288, while the sum is 32.

The square root of 18428243 is about 4292.8129472410. The cubic root of 18428243 is about 264.1362311505.

The spelling of 18428243 in words is "eighteen million, four hundred twenty-eight thousand, two hundred forty-three".