3987217 has 6 divisors (see below), whose sum is σ = 4317702. Its totient is φ = 3680352.

The previous prime is 3987199. The next prime is 3987227. The reversal of 3987217 is 7127893.

It can be written as a sum of positive squares in 3 ways, for example, as 239121 + 3748096 = 489^2 + 1936^2 .

It is a de Polignac number, because none of the positive numbers 2^k-3987217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3987227) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11628 + ... + 11965.

It is an arithmetic number, because the mean of its divisors is an integer number (719617).

Almost surely, 2^3987217 is an apocalyptic number.

It is an amenable number.

3987217 is a deficient number, since it is larger than the sum of its proper divisors (330485).

3987217 is a wasteful number, since it uses less digits than its factorization.

3987217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23619 (or 23606 counting only the distinct ones).

The product of its digits is 21168, while the sum is 37.

The square root of 3987217 is about 1996.8016927076. The cubic root of 3987217 is about 158.5708268477.

The spelling of 3987217 in words is "three million, nine hundred eighty-seven thousand, two hundred seventeen".