12856420 has 24 divisors (see below), whose sum is σ = 28587384. Its totient is φ = 4839936.

The previous prime is 12856399. The next prime is 12856423. The reversal of 12856420 is 2465821.

It can be written as a sum of positive squares in 4 ways, for example, as 82944 + 12773476 = 288^2 + 3574^2 .

It is not an unprimeable number, because it can be changed into a prime (12856423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18567 + ... + 19246.

It is an arithmetic number, because the mean of its divisors is an integer number (1191141).

Almost surely, 2^12856420 is an apocalyptic number.

12856420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12856420 is an abundant number, since it is smaller than the sum of its proper divisors (15730964).

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

12856420 is a wasteful number, since it uses less digits than its factorization.

12856420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37839 (or 37837 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 12856420 is about 3585.5850289737. The cubic root of 12856420 is about 234.2646092289.

The spelling of 12856420 in words is "twelve million, eight hundred fifty-six thousand, four hundred twenty".