3981697 has 4 divisors (see below), whose sum is σ = 4191280. Its totient is φ = 3772116.

The previous prime is 3981683. The next prime is 3981707. The reversal of 3981697 is 7961893.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7961893 = 19 ⋅419047.

It is a cyclic number.

It is not a de Polignac number, because 3981697 - 2⁷ = 3981569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3981617) 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, 104763 + ... + 104800.

It is an arithmetic number, because the mean of its divisors is an integer number (1047820).

Almost surely, 2^3981697 is an apocalyptic number.

It is an amenable number.

3981697 is a deficient number, since it is larger than the sum of its proper divisors (209583).

3981697 is a wasteful number, since it uses less digits than its factorization.

3981697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209582.

The product of its digits is 81648, while the sum is 43.

The square root of 3981697 is about 1995.4190036180. The cubic root of 3981697 is about 158.4976166187.

The spelling of 3981697 in words is "three million, nine hundred eighty-one thousand, six hundred ninety-seven".