1855221856 has 48 divisors (see below), whose sum is σ = 3702948480. Its totient is φ = 914872320.

The previous prime is 1855221839. The next prime is 1855221887. The reversal of 1855221856 is 6581225581.

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 7 ways as a sum of consecutive naturals, for example, 839505 + ... + 841711.

It is an arithmetic number, because the mean of its divisors is an integer number (77144760).

Almost surely, 2^1855221856 is an apocalyptic number.

1855221856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1855221856 is a deficient number, since it is larger than the sum of its proper divisors (1847726624).

1855221856 is a wasteful number, since it uses less digits than its factorization.

1855221856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2567 (or 2559 counting only the distinct ones).

The product of its digits is 192000, while the sum is 43.

The square root of 1855221856 is about 43072.2864032083. The cubic root of 1855221856 is about 1228.7549602248.

The spelling of 1855221856 in words is "one billion, eight hundred fifty-five million, two hundred twenty-one thousand, eight hundred fifty-six".