3900565 has 16 divisors (see below), whose sum is σ = 5013360. Its totient is φ = 2903040.

The previous prime is 3900563. The next prime is 3900569. The reversal of 3900565 is 5650093.

It is a happy number.

3900565 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 125316 + 3775249 = 354^2 + 1943^2 .

It is not a de Polignac number, because 3900565 - 2¹ = 3900563 is a prime.

3900565 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3900563) 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, 9055 + ... + 9475.

It is an arithmetic number, because the mean of its divisors is an integer number (313335).

Almost surely, 2^3900565 is an apocalyptic number.

It is an amenable number.

3900565 is a deficient number, since it is larger than the sum of its proper divisors (1112795).

3900565 is a wasteful number, since it uses less digits than its factorization.

3900565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 552.

The product of its (nonzero) digits is 4050, while the sum is 28.

The square root of 3900565 is about 1974.9848100682. The cubic root of 3900565 is about 157.4136925304.

Adding to 3900565 its product of nonzero digits (4050), we get a triangular number (3904615 = T₂₇₉₄).

It can be divided in two parts, 3900 and 565, that added together give a triangular number (4465 = T₉₄).

The spelling of 3900565 in words is "three million, nine hundred thousand, five hundred sixty-five".