6609421 has 24 divisors (see below), whose sum is σ = 8456064. Its totient is φ = 5054400.

The previous prime is 6609409. The next prime is 6609437. The reversal of 6609421 is 1249066.

It is a de Polignac number, because none of the positive numbers 2^k-6609421 is a prime.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6609421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6609221) 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 23 ways as a sum of consecutive naturals, for example, 43696 + ... + 43846.

It is an arithmetic number, because the mean of its divisors is an integer number (352336).

Almost surely, 2^6609421 is an apocalyptic number.

It is an amenable number.

6609421 is a deficient number, since it is larger than the sum of its proper divisors (1846643).

6609421 is a wasteful number, since it uses less digits than its factorization.

6609421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221 (or 208 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 6609421 is about 2570.8794215210. The cubic root of 6609421 is about 187.6669541111. Note that the first 3 decimals are identical.

The spelling of 6609421 in words is "six million, six hundred nine thousand, four hundred twenty-one".