18812003 has 8 divisors (see below), whose sum is σ = 21538560. Its totient is φ = 16095240.

The previous prime is 18811997. The next prime is 18812051. The reversal of 18812003 is 30021881.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18812003 - 2⁴ = 18811987 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 18812003.

It is not an unprimeable number, because it can be changed into a prime (18812063) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2288 + ... + 6546.

It is an arithmetic number, because the mean of its divisors is an integer number (2692320).

Almost surely, 2^18812003 is an apocalyptic number.

18812003 is a deficient number, since it is larger than the sum of its proper divisors (2726557).

18812003 is an equidigital number, since it uses as much as digits as its factorization.

18812003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4897.

The product of its (nonzero) digits is 384, while the sum is 23.

The square root of 18812003 is about 4337.2805996384. The cubic root of 18812003 is about 265.9571557430.

Adding to 18812003 its reverse (30021881), we get a palindrome (48833884).

The spelling of 18812003 in words is "eighteen million, eight hundred twelve thousand, three".