3971965 has 16 divisors (see below), whose sum is σ = 5116608. Its totient is φ = 2949376.

The previous prime is 3971963. The next prime is 3971977. The reversal of 3971965 is 5691793.

It is a cyclic number.

It is not a de Polignac number, because 3971965 - 2¹ = 3971963 is a prime.

It is a super-2 number, since 2×3971965² = 31553011922450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3971963) 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, 6774 + ... + 7336.

It is an arithmetic number, because the mean of its divisors is an integer number (319788).

Almost surely, 2^3971965 is an apocalyptic number.

It is an amenable number.

3971965 is a deficient number, since it is larger than the sum of its proper divisors (1144643).

3971965 is a wasteful number, since it uses less digits than its factorization.

3971965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 668.

The product of its digits is 51030, while the sum is 40.

The square root of 3971965 is about 1992.9789261304. The cubic root of 3971965 is about 158.3683788229.

The spelling of 3971965 in words is "three million, nine hundred seventy-one thousand, nine hundred sixty-five".