6388240 has 40 divisors (see below), whose sum is σ = 15177600. Its totient is φ = 2499456.

The previous prime is 6388219. The next prime is 6388253. The reversal of 6388240 is 428836.

It is a happy number.

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

It is a super-2 number, since 2×6388240² = 81619220595200, which contains 22 as substring.

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, 2911 + ... + 4609.

It is an arithmetic number, because the mean of its divisors is an integer number (379440).

Almost surely, 2^6388240 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 6388240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7588800).

6388240 is an abundant number, since it is smaller than the sum of its proper divisors (8789360).

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

6388240 is a wasteful number, since it uses less digits than its factorization.

6388240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1759 (or 1753 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 6388240 is about 2527.4967853590. The cubic root of 6388240 is about 185.5497646941.

The spelling of 6388240 in words is "six million, three hundred eighty-eight thousand, two hundred forty".