6400340 has 24 divisors (see below), whose sum is σ = 14148960. Its totient is φ = 2425248.

The previous prime is 6400259. The next prime is 6400349. The reversal of 6400340 is 430046.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6400349) 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, 8042 + ... + 8801.

It is an arithmetic number, because the mean of its divisors is an integer number (589540).

Almost surely, 2^6400340 is an apocalyptic number.

It is an amenable number.

6400340 is an abundant number, since it is smaller than the sum of its proper divisors (7748620).

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

6400340 is a wasteful number, since it uses less digits than its factorization.

6400340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16871 (or 16869 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 6400340 is about 2529.8893256425. The cubic root of 6400340 is about 185.6668410784. Note that the first 3 decimals are identical.

Adding to 6400340 its reverse (430046), we get a palindrome (6830386).

The spelling of 6400340 in words is "six million, four hundred thousand, three hundred forty".