3971005 has 4 divisors (see below), whose sum is σ = 4765212. Its totient is φ = 3176800.

The previous prime is 3970997. The next prime is 3971027. The reversal of 3971005 is 5001793.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5001793 = 887 ⋅5639.

It can be written as a sum of positive squares in 2 ways, for example, as 1666681 + 2304324 = 1291^2 + 1518^2 .

It is not a de Polignac number, because 3971005 - 2³ = 3970997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 397096 + ... + 397105.

It is an arithmetic number, because the mean of its divisors is an integer number (1191303).

Almost surely, 2^3971005 is an apocalyptic number.

It is an amenable number.

3971005 is a deficient number, since it is larger than the sum of its proper divisors (794207).

3971005 is an equidigital number, since it uses as much as digits as its factorization.

3971005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 794206.

The product of its (nonzero) digits is 945, while the sum is 25.

The square root of 3971005 is about 1992.7380660789. The cubic root of 3971005 is about 158.3556189007.

Adding to 3971005 its reverse (5001793), we get a palindrome (8972798).

The spelling of 3971005 in words is "three million, nine hundred seventy-one thousand, five".