2006643 has 8 divisors (see below), whose sum is σ = 2685328. Its totient is φ = 1332864.

The previous prime is 2006623. The next prime is 2006651. The reversal of 2006643 is 3466002.

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

It is not a de Polignac number, because 2006643 - 2⁵ = 2006611 is a prime.

It is a super-2 number, since 2×2006643² = 8053232258898, which contains 22 as substring.

It is a d-powerful number, because it can be written as 2¹⁷ + 0 + 0 + 6⁴ + 6⁷ + 4² + 3¹³ .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2006603) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 130 + ... + 2007.

It is an arithmetic number, because the mean of its divisors is an integer number (335666).

2^2006643 is an apocalyptic number.

2006643 is a deficient number, since it is larger than the sum of its proper divisors (678685).

2006643 is a wasteful number, since it uses less digits than its factorization.

2006643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2453.

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 2006643 is about 1416.5602705145. The cubic root of 2006643 is about 126.1314450894.

The spelling of 2006643 in words is "two million, six thousand, six hundred forty-three".