6443140 has 24 divisors (see below), whose sum is σ = 14761152. Its totient is φ = 2342880.

The previous prime is 6443131. The next prime is 6443159. The reversal of 6443140 is 413446.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14424 + ... + 14863.

It is an arithmetic number, because the mean of its divisors is an integer number (615048).

Almost surely, 2^6443140 is an apocalyptic number.

It is an amenable number.

6443140 is an abundant number, since it is smaller than the sum of its proper divisors (8318012).

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

6443140 is a wasteful number, since it uses less digits than its factorization.

6443140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29307 (or 29305 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 6443140 is about 2538.3340993652. The cubic root of 6443140 is about 186.0797823226.

Adding to 6443140 its reverse (413446), we get a palindrome (6856586).

The spelling of 6443140 in words is "six million, four hundred forty-three thousand, one hundred forty".