2001646 has 8 divisors (see below), whose sum is σ = 3011040. Its totient is φ = 997968.

The previous prime is 2001641. The next prime is 2001653. The reversal of 2001646 is 6461002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001641) 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, 406 + ... + 2041.

It is an arithmetic number, because the mean of its divisors is an integer number (376380).

2^2001646 is an apocalyptic number.

2001646 is a deficient number, since it is larger than the sum of its proper divisors (1009394).

2001646 is a wasteful number, since it uses less digits than its factorization.

2001646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2858.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 2001646 is about 1414.7953915673. The cubic root of 2001646 is about 126.0266593459.

Adding to 2001646 its reverse (6461002), we get a palindrome (8462648).

The spelling of 2001646 in words is "two million, one thousand, six hundred forty-six".