6430840 has 64 divisors (see below), whose sum is σ = 15876000. Its totient is φ = 2330112.

The previous prime is 6430829. The next prime is 6430841. The reversal of 6430840 is 480346.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6430841) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43086 + ... + 43234.

Almost surely, 2^6430840 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 6430840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7938000).

6430840 is an abundant number, since it is smaller than the sum of its proper divisors (9445160).

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

6430840 is a wasteful number, since it uses less digits than its factorization.

6430840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256 (or 252 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 6430840 is about 2535.9100930435. The cubic root of 6430840 is about 185.9612976861.

The spelling of 6430840 in words is "six million, four hundred thirty thousand, eight hundred forty".