2921905 has 16 divisors (see below), whose sum is σ = 4137984. Its totient is φ = 1938240.

The previous prime is 2921903. The next prime is 2921911. The reversal of 2921905 is 5091292.

2921905 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2921905 - 2¹ = 2921903 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2921903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 262 + ... + 2431.

It is an arithmetic number, because the mean of its divisors is an integer number (258624).

2^2921905 is an apocalyptic number.

It is an amenable number.

2921905 is a deficient number, since it is larger than the sum of its proper divisors (1216079).

2921905 is a wasteful number, since it uses less digits than its factorization.

2921905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2736.

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 2921905 is about 1709.3580666437. The cubic root of 2921905 is about 142.9624659017.

It can be divided in two parts, 292 and 1905, that added together give a cube (2197 = 13³).

The spelling of 2921905 in words is "two million, nine hundred twenty-one thousand, nine hundred five".