2123856 has 120 divisors (see below), whose sum is σ = 7092800. Its totient is φ = 592704.

The previous prime is 2123851. The next prime is 2123867. The reversal of 2123856 is 6583212.

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

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2123851) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 49371 + ... + 49413.

2^2123856 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 2123856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3546400).

2123856 is an abundant number, since it is smaller than the sum of its proper divisors (4968944).

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

2123856 is a wasteful number, since it uses less digits than its factorization.

2123856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78 (or 55 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 2123856 is about 1457.3455321234. The cubic root of 2123856 is about 128.5410044415.

The spelling of 2123856 in words is "two million, one hundred twenty-three thousand, eight hundred fifty-six".