3997187 has 4 divisors (see below), whose sum is σ = 4002096. Its totient is φ = 3992280.

The previous prime is 3997181. The next prime is 3997211. The reversal of 3997187 is 7817993.

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: 7817993 = 127 ⋅61559.

It is a cyclic number.

It is not a de Polignac number, because 3997187 - 2⁸ = 3996931 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (3997181) 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, 908 + ... + 2969.

It is an arithmetic number, because the mean of its divisors is an integer number (1000524).

Almost surely, 2^3997187 is an apocalyptic number.

3997187 is a deficient number, since it is larger than the sum of its proper divisors (4909).

3997187 is a wasteful number, since it uses less digits than its factorization.

3997187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4908.

The product of its digits is 95256, while the sum is 44.

The square root of 3997187 is about 1999.2966263164. The cubic root of 3997187 is about 158.7028851441.

The spelling of 3997187 in words is "three million, nine hundred ninety-seven thousand, one hundred eighty-seven".