12855810 has 64 divisors (see below), whose sum is σ = 34007040. Its totient is φ = 3084480.

The previous prime is 12855809. The next prime is 12855823. The reversal of 12855810 is 1855821.

It is a super-3 number, since 3×12855810³ (a number of 22 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (30).

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 31 ways as a sum of consecutive naturals, for example, 53671 + ... + 53909.

It is an arithmetic number, because the mean of its divisors is an integer number (531360).

Almost surely, 2^12855810 is an apocalyptic number.

12855810 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a pronic number, being equal to 3585×3586.

It is a practical number, because each smaller number is the sum of distinct divisors of 12855810, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17003520).

12855810 is an abundant number, since it is smaller than the sum of its proper divisors (21151230).

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

12855810 is a wasteful number, since it uses less digits than its factorization.

12855810 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 423.

The product of its (nonzero) digits is 3200, while the sum is 30.

The square root of 12855810 is about 3585.4999651374. The cubic root of 12855810 is about 234.2609041105.

The spelling of 12855810 in words is "twelve million, eight hundred fifty-five thousand, eight hundred ten".