5639840 has 48 divisors (see below), whose sum is σ = 13494600. Its totient is φ = 2227200.

The previous prime is 5639839. The next prime is 5639857. The reversal of 5639840 is 489365.

It can be written as a sum of positive squares in 4 ways, for example, as 5626384 + 13456 = 2372^2 + 116^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 5639840.

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, 15986 + ... + 16334.

Almost surely, 2^5639840 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 5639840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6747300).

5639840 is an abundant number, since it is smaller than the sum of its proper divisors (7854760).

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

5639840 is a wasteful number, since it uses less digits than its factorization.

5639840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 465 (or 457 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 5639840 is about 2374.8347310918. The cubic root of 5639840 is about 178.0009258042. Note that the first 3 decimals are identical.

The spelling of 5639840 in words is "five million, six hundred thirty-nine thousand, eight hundred forty".