1669648 has 20 divisors (see below), whose sum is σ = 3255868. Its totient is φ = 829440.

The previous prime is 1669637. The next prime is 1669649. The reversal of 1669648 is 8469661.

It can be written as a sum of positive squares in 2 ways, for example, as 685584 + 984064 = 828^2 + 992^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1669648.

It is not an unprimeable number, because it can be changed into a prime (1669649) 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, 3640 + ... + 4072.

2^1669648 is an apocalyptic number.

It is an amenable number.

1669648 is a deficient number, since it is larger than the sum of its proper divisors (1586220).

1669648 is a wasteful number, since it uses less digits than its factorization.

1669648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 682 (or 676 counting only the distinct ones).

The product of its digits is 62208, while the sum is 40.

The square root of 1669648 is about 1292.1485982657. The cubic root of 1669648 is about 118.6337632688.

Adding to 1669648 its product of digits (62208), we get a square (1731856 = 1316²).

The spelling of 1669648 in words is "one million, six hundred sixty-nine thousand, six hundred forty-eight".