1821826 has 16 divisors (see below), whose sum is σ = 2823480. Its totient is φ = 881280.

The previous prime is 1821821. The next prime is 1821847. The reversal of 1821826 is 6281281.

It can be written as a sum of positive squares in 4 ways, for example, as 1324801 + 497025 = 1151^2 + 705^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1821794 and 1821803.

It is not an unprimeable number, because it can be changed into a prime (1821821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13230 + ... + 13366.

2^1821826 is an apocalyptic number.

1821826 is a deficient number, since it is larger than the sum of its proper divisors (1001654).

1821826 is a wasteful number, since it uses less digits than its factorization.

1821826 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309.

The product of its digits is 1536, while the sum is 28.

The square root of 1821826 is about 1349.7503472865. The cubic root of 1821826 is about 122.1337331332.

The spelling of 1821826 in words is "one million, eight hundred twenty-one thousand, eight hundred twenty-six".