3791565 has 24 divisors (see below), whose sum is σ = 6640920. Its totient is φ = 2001024.

The previous prime is 3791563. The next prime is 3791569. The reversal of 3791565 is 5651973.

It is a happy number.

3791565 is a `hidden beast` number, since 3 + 7 + 91 + 565 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 93636 + 3697929 = 306^2 + 1923^2 .

It is not a de Polignac number, because 3791565 - 2¹ = 3791563 is a prime.

3791565 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3791563) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4519 + ... + 5291.

It is an arithmetic number, because the mean of its divisors is an integer number (276705).

Almost surely, 2^3791565 is an apocalyptic number.

It is an amenable number.

3791565 is a deficient number, since it is larger than the sum of its proper divisors (2849355).

3791565 is a wasteful number, since it uses less digits than its factorization.

3791565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 893 (or 890 counting only the distinct ones).

The product of its digits is 28350, while the sum is 36.

The square root of 3791565 is about 1947.1941351596. The cubic root of 3791565 is about 155.9335269060.

It can be divided in two parts, 3791 and 565, that added together give a square (4356 = 66²).

The spelling of 3791565 in words is "three million, seven hundred ninety-one thousand, five hundred sixty-five".