6697409 has 4 divisors (see below), whose sum is σ = 6731604. Its totient is φ = 6663216.

The previous prime is 6697403. The next prime is 6697423. The reversal of 6697409 is 9047966.

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 5640625 + 1056784 = 2375^2 + 1028^2 .

It is a cyclic number.

It is not a de Polignac number, because 6697409 - 2⁸ = 6697153 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6697403) 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, 16802 + ... + 17195.

It is an arithmetic number, because the mean of its divisors is an integer number (1682901).

Almost surely, 2^6697409 is an apocalyptic number.

It is an amenable number.

6697409 is a deficient number, since it is larger than the sum of its proper divisors (34195).

6697409 is a wasteful number, since it uses less digits than its factorization.

6697409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34194.

The product of its (nonzero) digits is 81648, while the sum is 41.

The square root of 6697409 is about 2587.9352773978. The cubic root of 6697409 is about 188.4960586623.

The spelling of 6697409 in words is "six million, six hundred ninety-seven thousand, four hundred nine".