6609940 has 24 divisors (see below), whose sum is σ = 14698152. Its totient is φ = 2488320.

The previous prime is 6609893. The next prime is 6609971. The reversal of 6609940 is 499066.

It can be written as a sum of positive squares in 4 ways, for example, as 685584 + 5924356 = 828^2 + 2434^2 .

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a junction number, because it is equal to n+sod(n) for n = 6609896 and 6609905.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9381 + ... + 10060.

It is an arithmetic number, because the mean of its divisors is an integer number (612423).

Almost surely, 2^6609940 is an apocalyptic number.

It is an amenable number.

6609940 is an abundant number, since it is smaller than the sum of its proper divisors (8088212).

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

6609940 is a wasteful number, since it uses less digits than its factorization.

6609940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19467 (or 19465 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 6609940 is about 2570.9803577624. The cubic root of 6609940 is about 187.6718661198.

The spelling of 6609940 in words is "six million, six hundred nine thousand, nine hundred forty".