1822813 has 4 divisors (see below), whose sum is σ = 1865248. Its totient is φ = 1780380.

The previous prime is 1822811. The next prime is 1822823. The reversal of 1822813 is 3182281.

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, and also an emirpimes, since its reverse is a distinct semiprime: 3182281 = 17 ⋅187193.

It is a cyclic number.

It is not a de Polignac number, because 1822813 - 2¹ = 1822811 is a prime.

It is a Duffinian number.

1822813 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1822811) 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, 21153 + ... + 21238.

It is an arithmetic number, because the mean of its divisors is an integer number (466312).

2^1822813 is an apocalyptic number.

It is an amenable number.

1822813 is a deficient number, since it is larger than the sum of its proper divisors (42435).

1822813 is an equidigital number, since it uses as much as digits as its factorization.

1822813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42434.

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

The square root of 1822813 is about 1350.1159209490. The cubic root of 1822813 is about 122.1557850437.

The spelling of 1822813 in words is "one million, eight hundred twenty-two thousand, eight hundred thirteen".