3987197 has 4 divisors (see below), whose sum is σ = 4221756. Its totient is φ = 3752640.

The previous prime is 3987173. The next prime is 3987199. The reversal of 3987197 is 7917893.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7917893 = 107 ⋅73999.

It can be written as a sum of positive squares in 2 ways, for example, as 2627641 + 1359556 = 1621^2 + 1166^2 .

It is a cyclic number.

It is not a de Polignac number, because 3987197 - 2¹⁰ = 3986173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3987199) 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, 117254 + ... + 117287.

It is an arithmetic number, because the mean of its divisors is an integer number (1055439).

Almost surely, 2^3987197 is an apocalyptic number.

It is an amenable number.

3987197 is a deficient number, since it is larger than the sum of its proper divisors (234559).

3987197 is a wasteful number, since it uses less digits than its factorization.

3987197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234558.

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

The square root of 3987197 is about 1996.7966846928. The cubic root of 3987197 is about 158.5705617153.

The spelling of 3987197 in words is "three million, nine hundred eighty-seven thousand, one hundred ninety-seven".