2905665 has 16 divisors (see below), whose sum is σ = 5313408. Its totient is φ = 1328256.

The previous prime is 2905631. The next prime is 2905667. The reversal of 2905665 is 5665092.

It is not a de Polignac number, because 2905665 - 2⁶ = 2905601 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2905667) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13732 + ... + 13941.

It is an arithmetic number, because the mean of its divisors is an integer number (332088).

2^2905665 is an apocalyptic number.

It is an amenable number.

2905665 is a deficient number, since it is larger than the sum of its proper divisors (2407743).

2905665 is a wasteful number, since it uses less digits than its factorization.

2905665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27688.

The product of its (nonzero) digits is 16200, while the sum is 33.

The square root of 2905665 is about 1704.6011263636. The cubic root of 2905665 is about 142.6971110337.

It can be divided in two parts, 2905 and 665, that added together give a triangular number (3570 = T₈₄).

The spelling of 2905665 in words is "two million, nine hundred five thousand, six hundred sixty-five".