6689993 has 8 divisors (see below), whose sum is σ = 7158312. Its totient is φ = 6230016.

The previous prime is 6689989. The next prime is 6689999. The reversal of 6689993 is 3999866.

It can be written as a sum of positive squares in 4 ways, for example, as 1658944 + 5031049 = 1288^2 + 2243^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6689993 - 2² = 6689989 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6689999) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 380 + ... + 3677.

It is an arithmetic number, because the mean of its divisors is an integer number (894789).

Almost surely, 2^6689993 is an apocalyptic number.

It is an amenable number.

6689993 is a deficient number, since it is larger than the sum of its proper divisors (468319).

6689993 is a wasteful number, since it uses less digits than its factorization.

6689993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4171.

The product of its digits is 629856, while the sum is 50.

The square root of 6689993 is about 2586.5020780970. The cubic root of 6689993 is about 188.4264594564.

The spelling of 6689993 in words is "six million, six hundred eighty-nine thousand, nine hundred ninety-three".