5639440 has 40 divisors (see below), whose sum is σ = 13224600. Its totient is φ = 2236416.

The previous prime is 5639411. The next prime is 5639453. The reversal of 5639440 is 449365.

It can be written as a sum of positive squares in 4 ways, for example, as 404496 + 5234944 = 636^2 + 2288^2 .

It is a tau number, because it is divible by the number of its divisors (40).

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, 12336 + ... + 12784.

It is an arithmetic number, because the mean of its divisors is an integer number (330615).

Almost surely, 2^5639440 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 5639440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6612300).

5639440 is an abundant number, since it is smaller than the sum of its proper divisors (7585160).

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

5639440 is a wasteful number, since it uses less digits than its factorization.

5639440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 619 (or 613 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 5639440 is about 2374.7505132119. The cubic root of 5639440 is about 177.9967175256.

The spelling of 5639440 in words is "five million, six hundred thirty-nine thousand, four hundred forty".