2005621 has 8 divisors (see below), whose sum is σ = 2124320. Its totient is φ = 1888272.

The previous prime is 2005613. The next prime is 2005667. The reversal of 2005621 is 1265002.

It is a happy number.

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 2005621 - 2³ = 2005613 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2005595 and 2005604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2005681) 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 7 ways as a sum of consecutive naturals, for example, 5191 + ... + 5563.

It is an arithmetic number, because the mean of its divisors is an integer number (265540).

2^2005621 is an apocalyptic number.

It is an amenable number.

2005621 is a deficient number, since it is larger than the sum of its proper divisors (118699).

2005621 is a wasteful number, since it uses less digits than its factorization.

2005621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 675.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 2005621 is about 1416.1994915971. The cubic root of 2005621 is about 126.1100281877.

The spelling of 2005621 in words is "two million, five thousand, six hundred twenty-one".