2169856 has 44 divisors (see below), whose sum is σ = 4699912. Its totient is φ = 995328.

The previous prime is 2169841. The next prime is 2169859. The reversal of 2169856 is 6589612.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2169859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13231 + ... + 13393.

2^2169856 is an apocalyptic number.

2169856 is a gapful number since it is divisible by the number (26) 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 2169856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2349956).

2169856 is an abundant number, since it is smaller than the sum of its proper divisors (2530056).

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

2169856 is a wasteful number, since it uses less digits than its factorization.

2169856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196 (or 178 counting only the distinct ones).

The product of its digits is 25920, while the sum is 37.

The square root of 2169856 is about 1473.0431086699. The cubic root of 2169856 is about 129.4623952270.

It can be divided in two parts, 2169 and 856, that added together give a square (3025 = 55²).

The spelling of 2169856 in words is "two million, one hundred sixty-nine thousand, eight hundred fifty-six".