2143872 has 48 divisors (see below), whose sum is σ = 6172530. Its totient is φ = 714240.

The previous prime is 2143861. The next prime is 2143873. The reversal of 2143872 is 2783412.

It can be written as a sum of positive squares in only one way, i.e., 2143296 + 576 = 1464^2 + 24^2 .

It is a tau number, because it is divible by the number of its divisors (48).

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

It is not an unprimeable number, because it can be changed into a prime (2143873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 222 + ... + 2082.

2^2143872 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 2143872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3086265).

2143872 is an abundant number, since it is smaller than the sum of its proper divisors (4028658).

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

2143872 is a wasteful number, since it uses less digits than its factorization.

2143872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1881 (or 1866 counting only the distinct ones).

The product of its digits is 2688, while the sum is 27.

The square root of 2143872 is about 1464.1967080963. The cubic root of 2143872 is about 128.9435484024.

The spelling of 2143872 in words is "two million, one hundred forty-three thousand, eight hundred seventy-two".