3855591 has 24 divisors (see below), whose sum is σ = 5812560. Its totient is φ = 2461056.

The previous prime is 3855581. The next prime is 3855623. The reversal of 3855591 is 1955583.

It is a happy number.

It is not a de Polignac number, because 3855591 - 2¹⁵ = 3822823 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.

3855591 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3855541) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28075 + ... + 28211.

It is an arithmetic number, because the mean of its divisors is an integer number (242190).

Almost surely, 2^3855591 is an apocalyptic number.

3855591 is a deficient number, since it is larger than the sum of its proper divisors (1956969).

3855591 is a wasteful number, since it uses less digits than its factorization.

3855591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255 (or 252 counting only the distinct ones).

The product of its digits is 27000, while the sum is 36.

The square root of 3855591 is about 1963.5658888868. The cubic root of 3855591 is about 156.8063524559.

The spelling of 3855591 in words is "three million, eight hundred fifty-five thousand, five hundred ninety-one".