3851805 has 16 divisors (see below), whose sum is σ = 6197184. Its totient is φ = 2042880.

The previous prime is 3851801. The next prime is 3851807. The reversal of 3851805 is 5081583.

It is a happy number.

It is not a de Polignac number, because 3851805 - 2² = 3851801 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3851801) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2557 + ... + 3773.

It is an arithmetic number, because the mean of its divisors is an integer number (387324).

Almost surely, 2^3851805 is an apocalyptic number.

It is an amenable number.

3851805 is a deficient number, since it is larger than the sum of its proper divisors (2345379).

3851805 is a wasteful number, since it uses less digits than its factorization.

3851805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1436.

The product of its (nonzero) digits is 4800, while the sum is 30.

The square root of 3851805 is about 1962.6015897273. The cubic root of 3851805 is about 156.7550102817.

It can be divided in two parts, 3851 and 805, that added together give a triangular number (4656 = T₉₆).

The spelling of 3851805 in words is "three million, eight hundred fifty-one thousand, eight hundred five".