12855840 has 48 divisors (see below), whose sum is σ = 40497408. Its totient is φ = 3428096.

The previous prime is 12855833. The next prime is 12855851. The reversal of 12855840 is 4855821.

It is a tau number, because it is divible by the number of its divisors (48).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12912 + ... + 13871.

It is an arithmetic number, because the mean of its divisors is an integer number (843696).

Almost surely, 2^12855840 is an apocalyptic number.

12855840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12855840 is an abundant number, since it is smaller than the sum of its proper divisors (27641568).

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

12855840 is a wasteful number, since it uses less digits than its factorization.

12855840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26801 (or 26793 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 33.

The square root of 12855840 is about 3585.5041486519. The cubic root of 12855840 is about 234.2610863322.

It can be divided in two parts, 12855 and 840, that added together give a triangular number (13695 = T₁₆₅).

The spelling of 12855840 in words is "twelve million, eight hundred fifty-five thousand, eight hundred forty".