12856890 has 16 divisors (see below), whose sum is σ = 30856608. Its totient is φ = 3428496.

The previous prime is 12856873. The next prime is 12856891. The reversal of 12856890 is 9865821.

It is not an unprimeable number, because it can be changed into a prime (12856891) 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 7 ways as a sum of consecutive naturals, for example, 214252 + ... + 214311.

It is an arithmetic number, because the mean of its divisors is an integer number (1928538).

Almost surely, 2^12856890 is an apocalyptic number.

12856890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12856890 is an abundant number, since it is smaller than the sum of its proper divisors (17999718).

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

12856890 is a wasteful number, since it uses less digits than its factorization.

12856890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428573.

The product of its (nonzero) digits is 34560, while the sum is 39.

The square root of 12856890 is about 3585.6505685858. The cubic root of 12856890 is about 234.2674639122.

The spelling of 12856890 in words is "twelve million, eight hundred fifty-six thousand, eight hundred ninety".