1821487266 has 12 divisors (see below), whose sum is σ = 3946555782. Its totient is φ = 607162416.

The previous prime is 1821487229. The next prime is 1821487331. The reversal of 1821487266 is 6627841281.

It can be written as a sum of positive squares in only one way, i.e., 1808375625 + 13111641 = 42525^2 + 3621^2 .

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 5 ways as a sum of consecutive naturals, for example, 50596851 + ... + 50596886.

Almost surely, 2^1821487266 is an apocalyptic number.

1821487266 is an abundant number, since it is smaller than the sum of its proper divisors (2125068516).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1821487266 is a wasteful number, since it uses less digits than its factorization.

1821487266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101193745 (or 101193742 counting only the distinct ones).

The product of its digits is 258048, while the sum is 45.

The square root of 1821487266 is about 42678.8854821679. The cubic root of 1821487266 is about 1221.2616318005.

The spelling of 1821487266 in words is "one billion, eight hundred twenty-one million, four hundred eighty-seven thousand, two hundred sixty-six".