3971865 has 8 divisors (see below), whose sum is σ = 6355008. Its totient is φ = 2118320.

The previous prime is 3971861. The next prime is 3971879. The reversal of 3971865 is 5681793.

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

It is not a de Polignac number, because 3971865 - 2² = 3971861 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3971861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 132381 + ... + 132410.

It is an arithmetic number, because the mean of its divisors is an integer number (794376).

Almost surely, 2^3971865 is an apocalyptic number.

It is an amenable number.

3971865 is a deficient number, since it is larger than the sum of its proper divisors (2383143).

3971865 is a wasteful number, since it uses less digits than its factorization.

3971865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264799.

The product of its digits is 45360, while the sum is 39.

The square root of 3971865 is about 1992.9538378999. The cubic root of 3971865 is about 158.3670497603.

The spelling of 3971865 in words is "three million, nine hundred seventy-one thousand, eight hundred sixty-five".