3971497 has 4 divisors (see below), whose sum is σ = 3976020. Its totient is φ = 3966976.

The previous prime is 3971483. The next prime is 3971501. The reversal of 3971497 is 7941793.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 7941793 = 1031 ⋅7703.

It can be written as a sum of positive squares in 2 ways, for example, as 1792921 + 2178576 = 1339^2 + 1476^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3971497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3971477) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 472 + ... + 2857.

It is an arithmetic number, because the mean of its divisors is an integer number (994005).

Almost surely, 2^3971497 is an apocalyptic number.

It is an amenable number.

3971497 is a deficient number, since it is larger than the sum of its proper divisors (4523).

3971497 is a wasteful number, since it uses less digits than its factorization.

3971497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4522.

The product of its digits is 47628, while the sum is 40.

The square root of 3971497 is about 1992.8615104919. The cubic root of 3971497 is about 158.3621586177.

The spelling of 3971497 in words is "three million, nine hundred seventy-one thousand, four hundred ninety-seven".