6405240 has 32 divisors (see below), whose sum is σ = 19216080. Its totient is φ = 1708032.

The previous prime is 6405221. The next prime is 6405263. The reversal of 6405240 is 425046.

It is a happy number.

6405240 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

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, 26569 + ... + 26808.

Almost surely, 2^6405240 is an apocalyptic number.

6405240 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6405240 is an abundant number, since it is smaller than the sum of its proper divisors (12810840).

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

6405240 is a wasteful number, since it uses less digits than its factorization.

6405240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53391 (or 53387 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 6405240 is about 2530.8575621714. The cubic root of 6405240 is about 185.7142102000.

The spelling of 6405240 in words is "six million, four hundred five thousand, two hundred forty".