1669889 has 12 divisors (see below), whose sum is σ = 1860012. Its totient is φ = 1497600.

The previous prime is 1669883. The next prime is 1669897. The reversal of 1669889 is 9889661.

It can be written as a sum of positive squares in 6 ways, for example, as 442225 + 1227664 = 665^2 + 1108^2 .

It is not a de Polignac number, because 1669889 - 2⁴ = 1669873 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1669883) 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, 6809 + ... + 7049.

It is an arithmetic number, because the mean of its divisors is an integer number (155001).

2^1669889 is an apocalyptic number.

It is an amenable number.

1669889 is a deficient number, since it is larger than the sum of its proper divisors (190123).

1669889 is a wasteful number, since it uses less digits than its factorization.

1669889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308 (or 295 counting only the distinct ones).

The product of its digits is 186624, while the sum is 47.

The square root of 1669889 is about 1292.2418504289. The cubic root of 1669889 is about 118.6394709312.

The spelling of 1669889 in words is "one million, six hundred sixty-nine thousand, eight hundred eighty-nine".