1669345 has 8 divisors (see below), whose sum is σ = 2018664. Its totient is φ = 1325184.

The previous prime is 1669331. The next prime is 1669351. The reversal of 1669345 is 5439661.

It can be written as a sum of positive squares in 4 ways, for example, as 589824 + 1079521 = 768^2 + 1039^2 .

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 1669345 - 2⁵ = 1669313 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 1669345.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 534 + ... + 1903.

It is an arithmetic number, because the mean of its divisors is an integer number (252333).

2^1669345 is an apocalyptic number.

It is an amenable number.

1669345 is a deficient number, since it is larger than the sum of its proper divisors (349319).

1669345 is a wasteful number, since it uses less digits than its factorization.

1669345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2579.

The product of its digits is 19440, while the sum is 34.

The square root of 1669345 is about 1292.0313463690. The cubic root of 1669345 is about 118.6265864657.

The spelling of 1669345 in words is "one million, six hundred sixty-nine thousand, three hundred forty-five".