2159856 has 60 divisors (see below), whose sum is σ = 6180408. Its totient is φ = 703872.

The previous prime is 2159831. The next prime is 2159881. The reversal of 2159856 is 6589512.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2159831) and next prime (2159881).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 2159856.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7491 + ... + 7773.

2^2159856 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2159856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3090204).

2159856 is an abundant number, since it is smaller than the sum of its proper divisors (4020552).

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

2159856 is a wasteful number, since it uses less digits than its factorization.

2159856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350 (or 341 counting only the distinct ones).

The product of its digits is 21600, while the sum is 36.

The square root of 2159856 is about 1469.6448550585. The cubic root of 2159856 is about 129.2632087585.

The spelling of 2159856 in words is "two million, one hundred fifty-nine thousand, eight hundred fifty-six".