3971197 has 4 divisors (see below), whose sum is σ = 4007740. Its totient is φ = 3934656.

The previous prime is 3971167. The next prime is 3971207. The reversal of 3971197 is 7911793.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3171961 + 799236 = 1781^2 + 894^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3971197 is a prime.

It is a super-2 number, since 2×3971197² = 31540811225618, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3971117) 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 3 ways as a sum of consecutive naturals, for example, 18108 + ... + 18325.

It is an arithmetic number, because the mean of its divisors is an integer number (1001935).

Almost surely, 2^3971197 is an apocalyptic number.

It is an amenable number.

3971197 is a deficient number, since it is larger than the sum of its proper divisors (36543).

3971197 is a wasteful number, since it uses less digits than its factorization.

3971197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36542.

The product of its digits is 11907, while the sum is 37.

The square root of 3971197 is about 1992.7862404182. The cubic root of 3971197 is about 158.3581710496.

It can be divided in two parts, 3971 and 197, that multiplied together give a palindrome (782287).

The spelling of 3971197 in words is "three million, nine hundred seventy-one thousand, one hundred ninety-seven".