1813822 has 4 divisors (see below), whose sum is σ = 2720736. Its totient is φ = 906910.

The previous prime is 1813817. The next prime is 1813829. The reversal of 1813822 is 2283181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2283181 = 31 ⋅73651.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1813829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 453454 + ... + 453457.

It is an arithmetic number, because the mean of its divisors is an integer number (680184).

2^1813822 is an apocalyptic number.

1813822 is a deficient number, since it is larger than the sum of its proper divisors (906914).

1813822 is an equidigital number, since it uses as much as digits as its factorization.

1813822 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 906913.

The product of its digits is 768, while the sum is 25.

The square root of 1813822 is about 1346.7820907630. The cubic root of 1813822 is about 121.9546100072.

The spelling of 1813822 in words is "one million, eight hundred thirteen thousand, eight hundred twenty-two".