2143856 has 40 divisors (see below), whose sum is σ = 4885104. Its totient is φ = 898560.

The previous prime is 2143847. The next prime is 2143859. The reversal of 2143856 is 6583412.

It is a super-2 number, since 2×2143856² = 9192237097472, which contains 22 as substring.

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 (2143859) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1820 + ... + 2756.

2^2143856 is an apocalyptic number.

2143856 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 2143856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2442552).

2143856 is an abundant number, since it is smaller than the sum of its proper divisors (2741248).

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

2143856 is a wasteful number, since it uses less digits than its factorization.

2143856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 969 (or 963 counting only the distinct ones).

The product of its digits is 5760, while the sum is 29.

The square root of 2143856 is about 1464.1912443393. The cubic root of 2143856 is about 128.9432276274.

The spelling of 2143856 in words is "two million, one hundred forty-three thousand, eight hundred fifty-six".