6438140 has 24 divisors (see below), whose sum is σ = 13568352. Its totient is φ = 2566080.

The previous prime is 6438109. The next prime is 6438143. The reversal of 6438140 is 418346.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6438143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9410 + ... + 10070.

It is an arithmetic number, because the mean of its divisors is an integer number (565348).

Almost surely, 2^6438140 is an apocalyptic number.

It is an amenable number.

6438140 is an abundant number, since it is smaller than the sum of its proper divisors (7130212).

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

6438140 is a wasteful number, since it uses less digits than its factorization.

6438140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1157 (or 1155 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 6438140 is about 2537.3490102861. The cubic root of 6438140 is about 186.0316360417.

The spelling of 6438140 in words is "six million, four hundred thirty-eight thousand, one hundred forty".