2905905621 has 16 divisors (see below), whose sum is σ = 4025020928. Its totient is φ = 1862827200.

The previous prime is 2905905577. The next prime is 2905905623. The reversal of 2905905621 is 1265095092.

It is not a de Polignac number, because 2905905621 - 2⁹ = 2905905109 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 2905905621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2905905623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84910 + ... + 114111.

It is an arithmetic number, because the mean of its divisors is an integer number (251563808).

Almost surely, 2^2905905621 is an apocalyptic number.

It is an amenable number.

2905905621 is a deficient number, since it is larger than the sum of its proper divisors (1119115307).

2905905621 is a wasteful number, since it uses less digits than its factorization.

2905905621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199212.

The product of its (nonzero) digits is 48600, while the sum is 39.

The square root of 2905905621 is about 53906.4524987501. The cubic root of 2905905621 is about 1427.0104988811.

The spelling of 2905905621 in words is "two billion, nine hundred five million, nine hundred five thousand, six hundred twenty-one".