1820003 has 8 divisors (see below), whose sum is σ = 1942560. Its totient is φ = 1699200.

The previous prime is 1819999. The next prime is 1820009. The reversal of 1820003 is 3000281.

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

It is a cyclic number.

It is not a de Polignac number, because 1820003 - 2² = 1819999 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 1820003.

It is not an unprimeable number, because it can be changed into a prime (1820009) 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, 2213 + ... + 2921.

It is an arithmetic number, because the mean of its divisors is an integer number (242820).

2^1820003 is an apocalyptic number.

1820003 is a deficient number, since it is larger than the sum of its proper divisors (122557).

1820003 is a wasteful number, since it uses less digits than its factorization.

1820003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 877.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 1820003 is about 1349.0748681967. The cubic root of 1820003 is about 122.0929820587.

Adding to 1820003 its reverse (3000281), we get a palindrome (4820284).

The spelling of 1820003 in words is "one million, eight hundred twenty thousand, three".