6894721 has 4 divisors (see below), whose sum is σ = 7132500. Its totient is φ = 6656944.

The previous prime is 6894697. The next prime is 6894731. The reversal of 6894721 is 1274986.

6894721 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3783025 + 3111696 = 1945^2 + 1764^2 .

It is a cyclic number.

It is not a de Polignac number, because 6894721 - 2⁷ = 6894593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6894731) 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, 118846 + ... + 118903.

It is an arithmetic number, because the mean of its divisors is an integer number (1783125).

Almost surely, 2^6894721 is an apocalyptic number.

It is an amenable number.

6894721 is a deficient number, since it is larger than the sum of its proper divisors (237779).

6894721 is a wasteful number, since it uses less digits than its factorization.

6894721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237778.

The product of its digits is 24192, while the sum is 37.

The square root of 6894721 is about 2625.7800745683. The cubic root of 6894721 is about 190.3292628652.

The spelling of 6894721 in words is "six million, eight hundred ninety-four thousand, seven hundred twenty-one".