6391240 has 32 divisors (see below), whose sum is σ = 15007680. Its totient is φ = 2444992.

The previous prime is 6391199. The next prime is 6391241. The reversal of 6391240 is 421936.

It is not an unprimeable number, because it can be changed into a prime (6391241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2554 + ... + 4393.

It is an arithmetic number, because the mean of its divisors is an integer number (468990).

Almost surely, 2^6391240 is an apocalyptic number.

It is an amenable number.

6391240 is an abundant number, since it is smaller than the sum of its proper divisors (8616440).

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

6391240 is a wasteful number, since it uses less digits than its factorization.

6391240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6981 (or 6977 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 6391240 is about 2528.0901882647. The cubic root of 6391240 is about 185.5788056704.

The spelling of 6391240 in words is "six million, three hundred ninety-one thousand, two hundred forty".