6637940 has 12 divisors (see below), whose sum is σ = 13939716. Its totient is φ = 2655168.

The previous prime is 6637933. The next prime is 6637949. The reversal of 6637940 is 497366.

It can be written as a sum of positive squares in 2 ways, for example, as 5207524 + 1430416 = 2282^2 + 1196^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 6637940.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6637949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 165929 + ... + 165968.

It is an arithmetic number, because the mean of its divisors is an integer number (1161643).

Almost surely, 2^6637940 is an apocalyptic number.

It is an amenable number.

6637940 is an abundant number, since it is smaller than the sum of its proper divisors (7301776).

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

6637940 is a wasteful number, since it uses less digits than its factorization.

6637940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331906 (or 331904 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 35.

The square root of 6637940 is about 2576.4199968173. The cubic root of 6637940 is about 187.9364882793.

The spelling of 6637940 in words is "six million, six hundred thirty-seven thousand, nine hundred forty".