12255840 has 96 divisors (see below), whose sum is σ = 42910560. Its totient is φ = 3267072.

The previous prime is 12255829. The next prime is 12255847. The reversal of 12255840 is 4855221.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×12255840² = 300411228211200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12255847) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2902 + ... + 5738.

It is an arithmetic number, because the mean of its divisors is an integer number (446985).

Almost surely, 2^12255840 is an apocalyptic number.

12255840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12255840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21455280).

12255840 is an abundant number, since it is smaller than the sum of its proper divisors (30654720).

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

12255840 is a wasteful number, since it uses less digits than its factorization.

12255840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2861 (or 2847 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

The square root of 12255840 is about 3500.8341863047. The cubic root of 12255840 is about 230.5584413654.

The spelling of 12255840 in words is "twelve million, two hundred fifty-five thousand, eight hundred forty".