12405855 has 64 divisors (see below), whose sum is σ = 25878528. Its totient is φ = 4920960.

The previous prime is 12405851. The next prime is 12405893. The reversal of 12405855 is 55850421.

12405855 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12405855 - 2² = 12405851 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12405851) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 26332 + ... + 26798.

It is an arithmetic number, because the mean of its divisors is an integer number (404352).

Almost surely, 2^12405855 is an apocalyptic number.

12405855 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12405855 is an abundant number, since it is smaller than the sum of its proper divisors (13472673).

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

12405855 is a wasteful number, since it uses less digits than its factorization.

12405855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 516.

The product of its (nonzero) digits is 8000, while the sum is 30.

The square root of 12405855 is about 3522.1946283532. The cubic root of 12405855 is about 231.4953296099.

The spelling of 12405855 in words is "twelve million, four hundred five thousand, eight hundred fifty-five".