6909021 has 24 divisors (see below), whose sum is σ = 12078144. Its totient is φ = 3715200.

The previous prime is 6909017. The next prime is 6909037. The reversal of 6909021 is 1209096.

It is a happy number.

It is not a de Polignac number, because 6909021 - 2² = 6909017 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6909011) 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 23 ways as a sum of consecutive naturals, for example, 2155 + ... + 4296.

It is an arithmetic number, because the mean of its divisors is an integer number (503256).

Almost surely, 2^6909021 is an apocalyptic number.

It is an amenable number.

6909021 is a deficient number, since it is larger than the sum of its proper divisors (5169123).

6909021 is a wasteful number, since it uses less digits than its factorization.

6909021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6481 (or 6478 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The square root of 6909021 is about 2628.5016644469. The cubic root of 6909021 is about 190.4607561710.

The spelling of 6909021 in words is "six million, nine hundred nine thousand, twenty-one".