3865091 has 4 divisors (see below), whose sum is σ = 3998400. Its totient is φ = 3731784.

The previous prime is 3865079. The next prime is 3865093. The reversal of 3865091 is 1905683.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 3865091 - 2¹⁴ = 3848707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3865093) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66611 + ... + 66668.

It is an arithmetic number, because the mean of its divisors is an integer number (999600).

Almost surely, 2^3865091 is an apocalyptic number.

3865091 is a deficient number, since it is larger than the sum of its proper divisors (133309).

3865091 is a wasteful number, since it uses less digits than its factorization.

3865091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133308.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 3865091 is about 1965.9834689030. The cubic root of 3865091 is about 156.9350347198.

The spelling of 3865091 in words is "three million, eight hundred sixty-five thousand, ninety-one".