6689969 has 12 divisors (see below), whose sum is σ = 7920948. Its totient is φ = 5612640.

The previous prime is 6689909. The next prime is 6689971. The reversal of 6689969 is 9699866.

It can be written as a sum of positive squares in 2 ways, for example, as 833569 + 5856400 = 913^2 + 2420^2 .

It is not a de Polignac number, because 6689969 - 2¹⁶ = 6624433 is a prime.

It is a super-2 number, since 2×6689969² = 89511370441922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 6689969.

It is not an unprimeable number, because it can be changed into a prime (6689909) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 554 + ... + 3699.

It is an arithmetic number, because the mean of its divisors is an integer number (660079).

Almost surely, 2^6689969 is an apocalyptic number.

It is an amenable number.

6689969 is a deficient number, since it is larger than the sum of its proper divisors (1230979).

6689969 is a wasteful number, since it uses less digits than its factorization.

6689969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4288 (or 4277 counting only the distinct ones).

The product of its digits is 1259712, while the sum is 53.

The square root of 6689969 is about 2586.4974386224. The cubic root of 6689969 is about 188.4262341327.

The spelling of 6689969 in words is "six million, six hundred eighty-nine thousand, nine hundred sixty-nine".