6669989 has 4 divisors (see below), whose sum is σ = 6682860. Its totient is φ = 6657120.

The previous prime is 6669983. The next prime is 6670019. The reversal of 6669989 is 9899666.

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 828100 + 5841889 = 910^2 + 2417^2 .

It is a cyclic number.

It is not a de Polignac number, because 6669989 - 2⁴ = 6669973 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6669989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6669983) 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, 5624 + ... + 6705.

It is an arithmetic number, because the mean of its divisors is an integer number (1670715).

Almost surely, 2^6669989 is an apocalyptic number.

It is an amenable number.

6669989 is a deficient number, since it is larger than the sum of its proper divisors (12871).

6669989 is a wasteful number, since it uses less digits than its factorization.

6669989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12870.

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

The square root of 6669989 is about 2582.6321844196. The cubic root of 6669989 is about 188.2384649378.

The spelling of 6669989 in words is "six million, six hundred sixty-nine thousand, nine hundred eighty-nine".