1800213 has 4 divisors (see below), whose sum is σ = 2400288. Its totient is φ = 1200140.

The previous prime is 1800209. The next prime is 1800221. The reversal of 1800213 is 3120081.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1800213 - 2² = 1800209 is a prime.

It is an Ulam number.

It is a D-number.

It is a junction number, because it is equal to n+sod(n) for n = 1800192 and 1800201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1800313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 300033 + ... + 300038.

It is an arithmetic number, because the mean of its divisors is an integer number (600072).

2^1800213 is an apocalyptic number.

It is an amenable number.

1800213 is a deficient number, since it is larger than the sum of its proper divisors (600075).

1800213 is an equidigital number, since it uses as much as digits as its factorization.

1800213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 600074.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 1800213 is about 1341.7201645649. The cubic root of 1800213 is about 121.6488379038.

Adding to 1800213 its reverse (3120081), we get a palindrome (4920294).

The spelling of 1800213 in words is "one million, eight hundred thousand, two hundred thirteen".