18272003 has 4 divisors (see below), whose sum is σ = 18283080. Its totient is φ = 18260928.

The previous prime is 18271963. The next prime is 18272017. The reversal of 18272003 is 30027281.

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 18272003 - 2²² = 14077699 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 18272003.

It is not an unprimeable number, because it can be changed into a prime (18272083) 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, 2513 + ... + 6546.

It is an arithmetic number, because the mean of its divisors is an integer number (4570770).

Almost surely, 2^18272003 is an apocalyptic number.

18272003 is a deficient number, since it is larger than the sum of its proper divisors (11077).

18272003 is an equidigital number, since it uses as much as digits as its factorization.

18272003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11076.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 18272003 is about 4274.5763532776. The cubic root of 18272003 is about 263.3876369699.

Adding to 18272003 its reverse (30027281), we get a palindrome (48299284).

The spelling of 18272003 in words is "eighteen million, two hundred seventy-two thousand, three".