18522003 has 4 divisors (see below), whose sum is σ = 24696008. Its totient is φ = 12348000.

The previous prime is 18521999. The next prime is 18522011. The reversal of 18522003 is 30022581.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 18522003 - 2² = 18521999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18522013) 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, 3086998 + ... + 3087003.

It is an arithmetic number, because the mean of its divisors is an integer number (6174002).

Almost surely, 2^18522003 is an apocalyptic number.

18522003 is a deficient number, since it is larger than the sum of its proper divisors (6174005).

18522003 is an equidigital number, since it uses as much as digits as its factorization.

18522003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6174004.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 18522003 is about 4303.7196702388. The cubic root of 18522003 is about 264.5834347627.

Adding to 18522003 its reverse (30022581), we get a palindrome (48544584).

The spelling of 18522003 in words is "eighteen million, five hundred twenty-two thousand, three".