12256405 has 16 divisors (see below), whose sum is σ = 17798400. Its totient is φ = 7909632.

The previous prime is 12256403. The next prime is 12256421. The reversal of 12256405 is 50465221.

It is a cyclic number.

It is not a de Polignac number, because 12256405 - 2¹ = 12256403 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12256405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12256403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9705 + ... + 10894.

It is an arithmetic number, because the mean of its divisors is an integer number (1112400).

Almost surely, 2^12256405 is an apocalyptic number.

It is an amenable number.

12256405 is a deficient number, since it is larger than the sum of its proper divisors (5541995).

12256405 is a wasteful number, since it uses less digits than its factorization.

12256405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20628.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 12256405 is about 3500.9148804277. The cubic root of 12256405 is about 230.5619842619.

The spelling of 12256405 in words is "twelve million, two hundred fifty-six thousand, four hundred five".