3985517 has 4 divisors (see below), whose sum is σ = 3989916. Its totient is φ = 3981120.

The previous prime is 3985511. The next prime is 3985519. The reversal of 3985517 is 7155893.

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: 7155893 = 431 ⋅16603.

It can be written as a sum of positive squares in 2 ways, for example, as 866761 + 3118756 = 931^2 + 1766^2 .

It is a cyclic number.

It is not a de Polignac number, because 3985517 - 2¹² = 3981421 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 (3985511) 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, 284 + ... + 2837.

It is an arithmetic number, because the mean of its divisors is an integer number (997479).

Almost surely, 2^3985517 is an apocalyptic number.

It is an amenable number.

3985517 is a deficient number, since it is larger than the sum of its proper divisors (4399).

3985517 is a wasteful number, since it uses less digits than its factorization.

3985517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4398.

The product of its digits is 37800, while the sum is 38.

The square root of 3985517 is about 1996.3759665955. The cubic root of 3985517 is about 158.5482874235.

The spelling of 3985517 in words is "three million, nine hundred eighty-five thousand, five hundred seventeen".