6400344 has 16 divisors (see below), whose sum is σ = 16000920. Its totient is φ = 2133440.

The previous prime is 6400259. The next prime is 6400349. The reversal of 6400344 is 4430046.

It is a self number, because there is not a number n which added to its sum of digits gives 6400344.

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 3 ways as a sum of consecutive naturals, for example, 133317 + ... + 133364.

Almost surely, 2^6400344 is an apocalyptic number.

It is an amenable number.

6400344 is an abundant number, since it is smaller than the sum of its proper divisors (9600576).

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

6400344 is a wasteful number, since it uses less digits than its factorization.

6400344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266690 (or 266686 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 6400344 is about 2529.8901161908. The cubic root of 6400344 is about 185.6668797569. Note that the first 3 decimals are identical.

The spelling of 6400344 in words is "six million, four hundred thousand, three hundred forty-four".