3881565 has 12 divisors (see below), whose sum is σ = 6728124. Its totient is φ = 2070144.

The previous prime is 3881543. The next prime is 3881573. The reversal of 3881565 is 5651883.

It can be written as a sum of positive squares in 2 ways, for example, as 488601 + 3392964 = 699^2 + 1842^2 .

It is not a de Polignac number, because 3881565 - 2¹¹ = 3879517 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 43084 + ... + 43173.

It is an arithmetic number, because the mean of its divisors is an integer number (560677).

Almost surely, 2^3881565 is an apocalyptic number.

It is an amenable number.

3881565 is a deficient number, since it is larger than the sum of its proper divisors (2846559).

3881565 is a wasteful number, since it uses less digits than its factorization.

3881565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86268 (or 86265 counting only the distinct ones).

The product of its digits is 28800, while the sum is 36.

The square root of 3881565 is about 1970.1687744962. The cubic root of 3881565 is about 157.1576843546.

It can be divided in two parts, 388 and 1565, that added together give a triangular number (1953 = T₆₂).

The spelling of 3881565 in words is "three million, eight hundred eighty-one thousand, five hundred sixty-five".