12019856 has 30 divisors (see below), whose sum is σ = 24590502. Its totient is φ = 5690880.

The previous prime is 12019849. The next prime is 12019871. The reversal of 12019856 is 65891021.

It can be written as a sum of positive squares in only one way, i.e., 9709456 + 2310400 = 3116^2 + 1520^2 .

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 4736 + ... + 6816.

Almost surely, 2^12019856 is an apocalyptic number.

12019856 is a gapful number since it is divisible by the number (16) 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 12019856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12295251).

12019856 is an abundant number, since it is smaller than the sum of its proper divisors (12570646).

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

12019856 is a wasteful number, since it uses less digits than its factorization.

12019856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2127 (or 2102 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 32.

The square root of 12019856 is about 3466.9663972989. The cubic root of 12019856 is about 229.0690536271.

The spelling of 12019856 in words is "twelve million, nineteen thousand, eight hundred fifty-six".