6921897 has 16 divisors (see below), whose sum is σ = 9596928. Its totient is φ = 4433040.

The previous prime is 6921883. The next prime is 6921917. The reversal of 6921897 is 7981296.

It is not a de Polignac number, because 6921897 - 2¹⁴ = 6905513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6921847) 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 15 ways as a sum of consecutive naturals, for example, 24318 + ... + 24600.

It is an arithmetic number, because the mean of its divisors is an integer number (599808).

Almost surely, 2^6921897 is an apocalyptic number.

It is an amenable number.

6921897 is a deficient number, since it is larger than the sum of its proper divisors (2675031).

6921897 is a wasteful number, since it uses less digits than its factorization.

6921897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 580.

The product of its digits is 54432, while the sum is 42.

The square root of 6921897 is about 2630.9498284840. The cubic root of 6921897 is about 190.5790001700.

The spelling of 6921897 in words is "six million, nine hundred twenty-one thousand, eight hundred ninety-seven".