3878565 has 32 divisors (see below), whose sum is σ = 6758400. Its totient is φ = 1892160.

The previous prime is 3878561. The next prime is 3878597. The reversal of 3878565 is 5658783.

It is not a de Polignac number, because 3878565 - 2² = 3878561 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3878561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8616 + ... + 9054.

It is an arithmetic number, because the mean of its divisors is an integer number (211200).

Almost surely, 2^3878565 is an apocalyptic number.

It is an amenable number.

3878565 is a deficient number, since it is larger than the sum of its proper divisors (2879835).

3878565 is a wasteful number, since it uses less digits than its factorization.

3878565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 497.

The product of its digits is 201600, while the sum is 42.

The square root of 3878565 is about 1969.4072712367. The cubic root of 3878565 is about 157.1171856923.

The spelling of 3878565 in words is "three million, eight hundred seventy-eight thousand, five hundred sixty-five".