1668825 has 18 divisors (see below), whose sum is σ = 2989454. Its totient is φ = 889920.

The previous prime is 1668803. The next prime is 1668833. The reversal of 1668825 is 5288661.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 278784 + 1390041 = 528^2 + 1179^2 .

It is not a de Polignac number, because 1668825 - 2⁹ = 1668313 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 1668825.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 3484 + ... + 3933.

2^1668825 is an apocalyptic number.

1668825 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1668825 is a deficient number, since it is larger than the sum of its proper divisors (1320629).

1668825 is a wasteful number, since it uses less digits than its factorization.

1668825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7433 (or 7425 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 1668825 is about 1291.8300971877. The cubic root of 1668825 is about 118.6142678155.

The spelling of 1668825 in words is "one million, six hundred sixty-eight thousand, eight hundred twenty-five".