1821116 has 12 divisors (see below), whose sum is σ = 3476760. Its totient is φ = 827760.

The previous prime is 1821107. The next prime is 1821121. The reversal of 1821116 is 6111281.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20651 + ... + 20738.

It is an arithmetic number, because the mean of its divisors is an integer number (289730).

2^1821116 is an apocalyptic number.

It is an amenable number.

1821116 is a deficient number, since it is larger than the sum of its proper divisors (1655644).

1821116 is a wasteful number, since it uses less digits than its factorization.

1821116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41404 (or 41402 counting only the distinct ones).

The product of its digits is 96, while the sum is 20.

The square root of 1821116 is about 1349.4873100552. The cubic root of 1821116 is about 122.1178651308.

Adding to 1821116 its reverse (6111281), we get a palindrome (7932397).

The spelling of 1821116 in words is "one million, eight hundred twenty-one thousand, one hundred sixteen".