3871845 has 24 divisors (see below), whose sum is σ = 6770400. Its totient is φ = 2046816.

The previous prime is 3871841. The next prime is 3871871. The reversal of 3871845 is 5481783.

3871845 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 3871845 - 2² = 3871841 is a prime.

3871845 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3871841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5946 + ... + 6564.

It is an arithmetic number, because the mean of its divisors is an integer number (282100).

Almost surely, 2^3871845 is an apocalyptic number.

It is an amenable number.

3871845 is a deficient number, since it is larger than the sum of its proper divisors (2898555).

3871845 is a wasteful number, since it uses less digits than its factorization.

3871845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 769 (or 766 counting only the distinct ones).

The product of its digits is 26880, while the sum is 36.

The square root of 3871845 is about 1967.7004345174. The cubic root of 3871845 is about 157.0263928475.

The spelling of 3871845 in words is "three million, eight hundred seventy-one thousand, eight hundred forty-five".