2143644 has 24 divisors (see below), whose sum is σ = 5125008. Its totient is φ = 696960.

The previous prime is 2143627. The next prime is 2143667. The reversal of 2143644 is 4463412.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1687 + ... + 2670.

It is an arithmetic number, because the mean of its divisors is an integer number (213542).

2^2143644 is an apocalyptic number.

It is an amenable number.

2143644 is an abundant number, since it is smaller than the sum of its proper divisors (2981364).

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

2143644 is a wasteful number, since it uses less digits than its factorization.

2143644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4405 (or 4403 counting only the distinct ones).

The product of its digits is 2304, while the sum is 24.

The square root of 2143644 is about 1464.1188476350. The cubic root of 2143644 is about 128.9389772074.

The spelling of 2143644 in words is "two million, one hundred forty-three thousand, six hundred forty-four".