3261665 has 16 divisors (see below), whose sum is σ = 4409856. Its totient is φ = 2294400.

The previous prime is 3261641. The next prime is 3261667. The reversal of 3261665 is 5661623.

It is not a de Polignac number, because 3261665 - 2¹⁶ = 3196129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3261667) 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, 749 + ... + 2661.

It is an arithmetic number, because the mean of its divisors is an integer number (275616).

Almost surely, 2^3261665 is an apocalyptic number.

It is an amenable number.

3261665 is a deficient number, since it is larger than the sum of its proper divisors (1148191).

3261665 is a wasteful number, since it uses less digits than its factorization.

3261665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1960.

The product of its digits is 6480, while the sum is 29.

The square root of 3261665 is about 1806.0080287751. The cubic root of 3261665 is about 148.3018098507.

Subtracting from 3261665 its sum of digits (29), we obtain a square (3261636 = 1806²).

It can be divided in two parts, 326 and 1665, that added together give a palindrome (1991).

The spelling of 3261665 in words is "three million, two hundred sixty-one thousand, six hundred sixty-five".