18243299 has 4 divisors (see below), whose sum is σ = 18251880. Its totient is φ = 18234720.

The previous prime is 18243293. The next prime is 18243343. The reversal of 18243299 is 99234281.

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 18243299 - 2¹² = 18239203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18243293) 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, 1544 + ... + 6234.

It is an arithmetic number, because the mean of its divisors is an integer number (4562970).

Almost surely, 2^18243299 is an apocalyptic number.

18243299 is a deficient number, since it is larger than the sum of its proper divisors (8581).

18243299 is an equidigital number, since it uses as much as digits as its factorization.

18243299 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8580.

The product of its digits is 31104, while the sum is 38.

The square root of 18243299 is about 4271.2175079244. The cubic root of 18243299 is about 263.2496436863.

The spelling of 18243299 in words is "eighteen million, two hundred forty-three thousand, two hundred ninety-nine".