3661765 has 8 divisors (see below), whose sum is σ = 4433688. Its totient is φ = 2903040.

The previous prime is 3661759. The next prime is 3661771. The reversal of 3661765 is 5671663.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (3661759) and next prime (3661771).

It can be written as a sum of positive squares in 4 ways, for example, as 272484 + 3389281 = 522^2 + 1841^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3661765 - 2⁵ = 3661733 is a prime.

It is a Duffinian number.

3661765 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 3661765.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2676 + ... + 3805.

It is an arithmetic number, because the mean of its divisors is an integer number (554211).

Almost surely, 2^3661765 is an apocalyptic number.

It is an amenable number.

3661765 is a deficient number, since it is larger than the sum of its proper divisors (771923).

3661765 is a wasteful number, since it uses less digits than its factorization.

3661765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6599.

The product of its digits is 22680, while the sum is 34.

The square root of 3661765 is about 1913.5738815107. The cubic root of 3661765 is about 154.1334229107.

The spelling of 3661765 in words is "three million, six hundred sixty-one thousand, seven hundred sixty-five".