2006621 has 8 divisors (see below), whose sum is σ = 2078904. Its totient is φ = 1935360.

The previous prime is 2006611. The next prime is 2006623. The reversal of 2006621 is 1266002.

It can be written as a sum of positive squares in 4 ways, for example, as 592900 + 1413721 = 770^2 + 1189^2 .

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 2006621 - 2¹⁴ = 1990237 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2006621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2006623) 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, 7001 + ... + 7281.

It is an arithmetic number, because the mean of its divisors is an integer number (259863).

2^2006621 is an apocalyptic number.

It is an amenable number.

2006621 is a deficient number, since it is larger than the sum of its proper divisors (72283).

2006621 is a wasteful number, since it uses less digits than its factorization.

2006621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 2006621 is about 1416.5525052041. The cubic root of 2006621 is about 126.1309841368.

The spelling of 2006621 in words is "two million, six thousand, six hundred twenty-one".