3865591 has 2 divisors, whose sum is σ = 3865592. Its totient is φ = 3865590.

The previous prime is 3865577. The next prime is 3865601. The reversal of 3865591 is 1955683.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 3865591 - 2⁹ = 3865079 is a prime.

It is a Chen prime.

It is a pancake number, because a pancake can be divided into 3865591 parts by 2780 straight cuts.

3865591 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 3865591.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3865691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1932795 + 1932796.

It is an arithmetic number, because the mean of its divisors is an integer number (1932796).

Almost surely, 2^3865591 is an apocalyptic number.

3865591 is a deficient number, since it is larger than the sum of its proper divisors (1).

3865591 is an equidigital number, since it uses as much as digits as its factorization.

3865591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32400, while the sum is 37.

The square root of 3865591 is about 1966.1106276097. The cubic root of 3865591 is about 156.9418016268.

The spelling of 3865591 in words is "three million, eight hundred sixty-five thousand, five hundred ninety-one".