2005885621 has 6 divisors (see below), whose sum is σ = 2017573922. Its totient is φ = 1994204160.

The previous prime is 2005885619. The next prime is 2005885633. The reversal of 2005885621 is 1265885002.

It can be written as a sum of positive squares in 3 ways, for example, as 6812100 + 1999073521 = 2610^2 + 44711^2 .

It is not a de Polignac number, because 2005885621 - 2¹ = 2005885619 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2005885421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 600885 + ... + 604213.

Almost surely, 2^2005885621 is an apocalyptic number.

It is an amenable number.

2005885621 is a deficient number, since it is larger than the sum of its proper divisors (11688301).

2005885621 is an frugal number, since it uses more digits than its factorization.

2005885621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6839 (or 3510 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 37.

The square root of 2005885621 is about 44787.1144527084. The cubic root of 2005885621 is about 1261.1557424952.

The spelling of 2005885621 in words is "two billion, five million, eight hundred eighty-five thousand, six hundred twenty-one".