1800219 has 4 divisors (see below), whose sum is σ = 2400296. Its totient is φ = 1200144.

The previous prime is 1800209. The next prime is 1800221. The reversal of 1800219 is 9120081.

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

It is not a de Polignac number, because 1800219 - 2⁷ = 1800091 is a prime.

It is a super-2 number, since 2×1800219² = 6481576895922, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1800195 and 1800204.

It is not an unprimeable number, because it can be changed into a prime (1800209) 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, 300034 + ... + 300039.

It is an arithmetic number, because the mean of its divisors is an integer number (600074).

2^1800219 is an apocalyptic number.

1800219 is a deficient number, since it is larger than the sum of its proper divisors (600077).

1800219 is an equidigital number, since it uses as much as digits as its factorization.

1800219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 600076.

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 1800219 is about 1341.7224004987. The cubic root of 1800219 is about 121.6489730530.

The spelling of 1800219 in words is "one million, eight hundred thousand, two hundred nineteen".