5643840 has 56 divisors (see below), whose sum is σ = 17922240. Its totient is φ = 1504768.

The previous prime is 5643821. The next prime is 5643851. The reversal of 5643840 is 483465.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 5643798 and 5643807.

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, 1980 + ... + 3899.

It is an arithmetic number, because the mean of its divisors is an integer number (320040).

Almost surely, 2^5643840 is an apocalyptic number.

It is an amenable number.

5643840 is an abundant number, since it is smaller than the sum of its proper divisors (12278400).

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

5643840 is a wasteful number, since it uses less digits than its factorization.

5643840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5899 (or 5889 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 5643840 is about 2375.6767456874. The cubic root of 5643840 is about 178.0429976504.

The spelling of 5643840 in words is "five million, six hundred forty-three thousand, eight hundred forty".