2001668 has 6 divisors (see below), whose sum is σ = 3502926. Its totient is φ = 1000832.

The previous prime is 2001653. The next prime is 2001673. The reversal of 2001668 is 8661002.

It can be written as a sum of positive squares in only one way, i.e., 1800964 + 200704 = 1342^2 + 448^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 250205 + ... + 250212.

It is an arithmetic number, because the mean of its divisors is an integer number (583821).

2^2001668 is an apocalyptic number.

It is an amenable number.

2001668 is a deficient number, since it is larger than the sum of its proper divisors (1501258).

2001668 is a wasteful number, since it uses less digits than its factorization.

2001668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 500421 (or 500419 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 2001668 is about 1414.8031665218. The cubic root of 2001668 is about 126.0271210620.

The spelling of 2001668 in words is "two million, one thousand, six hundred sixty-eight".