1821268 has 6 divisors (see below), whose sum is σ = 3187226. Its totient is φ = 910632.

The previous prime is 1821263. The next prime is 1821289. The reversal of 1821268 is 8621281.

It can be written as a sum of positive squares in only one way, i.e., 1607824 + 213444 = 1268^2 + 462^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1821263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 227655 + ... + 227662.

2^1821268 is an apocalyptic number.

It is an amenable number.

1821268 is a deficient number, since it is larger than the sum of its proper divisors (1365958).

1821268 is a wasteful number, since it uses less digits than its factorization.

1821268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 455321 (or 455319 counting only the distinct ones).

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

The square root of 1821268 is about 1349.5436265642. The cubic root of 1821268 is about 122.1212625712.

The spelling of 1821268 in words is "one million, eight hundred twenty-one thousand, two hundred sixty-eight".