3971845 has 8 divisors (see below), whose sum is σ = 4792320. Its totient is φ = 3160080.

The previous prime is 3971843. The next prime is 3971861. The reversal of 3971845 is 5481793.

3971845 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3971845 - 2¹ = 3971843 is a prime.

3971845 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3971843) 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 7 ways as a sum of consecutive naturals, for example, 1125 + ... + 3034.

It is an arithmetic number, because the mean of its divisors is an integer number (599040).

Almost surely, 2^3971845 is an apocalyptic number.

It is an amenable number.

3971845 is a deficient number, since it is larger than the sum of its proper divisors (820475).

3971845 is a wasteful number, since it uses less digits than its factorization.

3971845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4355.

The product of its digits is 30240, while the sum is 37.

The square root of 3971845 is about 1992.9488202159. The cubic root of 3971845 is about 158.3667839451.

The spelling of 3971845 in words is "three million, nine hundred seventy-one thousand, eight hundred forty-five".