1668545 has 8 divisors (see below), whose sum is σ = 2010624. Its totient is φ = 1329264.

The previous prime is 1668539. The next prime is 1668551. The reversal of 1668545 is 5458661.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1668539) and next prime (1668551).

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 1668545 - 2⁶ = 1668481 is a prime.

It is an Ulam number.

It is a Duffinian number.

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, 992 + ... + 2078.

It is an arithmetic number, because the mean of its divisors is an integer number (251328).

2^1668545 is an apocalyptic number.

It is an amenable number.

1668545 is a deficient number, since it is larger than the sum of its proper divisors (342079).

1668545 is a wasteful number, since it uses less digits than its factorization.

1668545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1399.

The product of its digits is 28800, while the sum is 35.

The square root of 1668545 is about 1291.7217192569. The cubic root of 1668545 is about 118.6076336362.

The spelling of 1668545 in words is "one million, six hundred sixty-eight thousand, five hundred forty-five".