6393840 has 40 divisors (see below), whose sum is σ = 19821648. Its totient is φ = 1704960.

The previous prime is 6393817. The next prime is 6393841. The reversal of 6393840 is 483936.

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

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6393841) 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, 13081 + ... + 13560.

Almost surely, 2^6393840 is an apocalyptic number.

6393840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6393840 is an abundant number, since it is smaller than the sum of its proper divisors (13427808).

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

6393840 is a wasteful number, since it uses less digits than its factorization.

6393840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26657 (or 26651 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 33.

The square root of 6393840 is about 2528.6043581391. The cubic root of 6393840 is about 185.6039671665.

The spelling of 6393840 in words is "six million, three hundred ninety-three thousand, eight hundred forty".