6909421 has 4 divisors (see below), whose sum is σ = 6925600. Its totient is φ = 6893244.

The previous prime is 6909391. The next prime is 6909437. The reversal of 6909421 is 1249096.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6909421 - 2⁵ = 6909389 is a prime.

It is a Duffinian number.

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6904421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7431 + ... + 8308.

It is an arithmetic number, because the mean of its divisors is an integer number (1731400).

Almost surely, 2^6909421 is an apocalyptic number.

It is an amenable number.

6909421 is a deficient number, since it is larger than the sum of its proper divisors (16179).

6909421 is a wasteful number, since it uses less digits than its factorization.

6909421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16178.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 6909421 is about 2628.5777523216. The cubic root of 6909421 is about 190.4644316957.

The spelling of 6909421 in words is "six million, nine hundred nine thousand, four hundred twenty-one".