1668007 has 4 divisors (see below), whose sum is σ = 1819656. Its totient is φ = 1516360.

The previous prime is 1668001. The next prime is 1668011. The reversal of 1668007 is 7008661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1668007 - 2¹⁹ = 1143719 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1668001) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 75808 + ... + 75829.

It is an arithmetic number, because the mean of its divisors is an integer number (454914).

2^1668007 is an apocalyptic number.

1668007 is a deficient number, since it is larger than the sum of its proper divisors (151649).

1668007 is a wasteful number, since it uses less digits than its factorization.

1668007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151648.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 1668007 is about 1291.5134532787. The cubic root of 1668007 is about 118.5948844513.

The spelling of 1668007 in words is "one million, six hundred sixty-eight thousand, seven".