1808219 has 4 divisors (see below), whose sum is σ = 2066544. Its totient is φ = 1549896.

The previous prime is 1808207. The next prime is 1808243. The reversal of 1808219 is 9128081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9128081 = 191 ⋅47791.

It is a cyclic number.

It is not a de Polignac number, because 1808219 - 2⁸ = 1807963 is a prime.

It is a super-2 number, since 2×1808219² = 6539311903922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1808191 and 1808200.

It is not an unprimeable number, because it can be changed into a prime (1808269) 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, 129152 + ... + 129165.

It is an arithmetic number, because the mean of its divisors is an integer number (516636).

2^1808219 is an apocalyptic number.

1808219 is a deficient number, since it is larger than the sum of its proper divisors (258325).

1808219 is an equidigital number, since it uses as much as digits as its factorization.

1808219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258324.

The product of its (nonzero) digits is 1152, while the sum is 29.

The square root of 1808219 is about 1344.7003383654. The cubic root of 1808219 is about 121.8289055580.

The spelling of 1808219 in words is "one million, eight hundred eight thousand, two hundred nineteen".