3971885 has 8 divisors (see below), whose sum is σ = 4777080. Its totient is φ = 3170304.

The previous prime is 3971881. The next prime is 3971887. The reversal of 3971885 is 5881793.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1142761 + 2829124 = 1069^2 + 1682^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 3971885 - 2² = 3971881 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3971881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3329 + ... + 4361.

It is an arithmetic number, because the mean of its divisors is an integer number (597135).

Almost surely, 2^3971885 is an apocalyptic number.

It is an amenable number.

3971885 is a deficient number, since it is larger than the sum of its proper divisors (805195).

3971885 is a wasteful number, since it uses less digits than its factorization.

3971885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1807.

The product of its digits is 60480, while the sum is 41.

The square root of 3971885 is about 1992.9588555713. The cubic root of 3971885 is about 158.3673155746.

The spelling of 3971885 in words is "three million, nine hundred seventy-one thousand, eight hundred eighty-five".