18022803 has 4 divisors (see below), whose sum is σ = 24030408. Its totient is φ = 12015200.

The previous prime is 18022801. The next prime is 18022817. The reversal of 18022803 is 30822081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30822081 = 3 ⋅10274027.

It is a cyclic number.

It is not a de Polignac number, because 18022803 - 2¹ = 18022801 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18022801) 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, 3003798 + ... + 3003803.

It is an arithmetic number, because the mean of its divisors is an integer number (6007602).

Almost surely, 2^18022803 is an apocalyptic number.

18022803 is a deficient number, since it is larger than the sum of its proper divisors (6007605).

18022803 is an equidigital number, since it uses as much as digits as its factorization.

18022803 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6007604.

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 18022803 is about 4245.3271958708. The cubic root of 18022803 is about 262.1847608063.

Adding to 18022803 its reverse (30822081), we get a palindrome (48844884).

The spelling of 18022803 in words is "eighteen million, twenty-two thousand, eight hundred three".