1821254856 has 32 divisors (see below), whose sum is σ = 4554929760. Its totient is φ = 606845952.

The previous prime is 1821254833. The next prime is 1821254873. The reversal of 1821254856 is 6584521281.

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 7 ways as a sum of consecutive naturals, for example, 53736 + ... + 80808.

It is an arithmetic number, because the mean of its divisors is an integer number (142341555).

Almost surely, 2^1821254856 is an apocalyptic number.

It is an amenable number.

1821254856 is an abundant number, since it is smaller than the sum of its proper divisors (2733674904).

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

1821254856 is a wasteful number, since it uses less digits than its factorization.

1821254856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29885 (or 29881 counting only the distinct ones).

The product of its digits is 153600, while the sum is 42.

The square root of 1821254856 is about 42676.1626203669. The cubic root of 1821254856 is about 1221.2096878948.

The spelling of 1821254856 in words is "one billion, eight hundred twenty-one million, two hundred fifty-four thousand, eight hundred fifty-six".