3986509 has 4 divisors (see below), whose sum is σ = 4008960. Its totient is φ = 3964060.

The previous prime is 3986503. The next prime is 3986513. The reversal of 3986509 is 9056893.

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: 9056893 = 103 ⋅87931.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3986509 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 (3986503) 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, 10957 + ... + 11314.

It is an arithmetic number, because the mean of its divisors is an integer number (1002240).

Almost surely, 2^3986509 is an apocalyptic number.

It is an amenable number.

3986509 is a deficient number, since it is larger than the sum of its proper divisors (22451).

3986509 is a wasteful number, since it uses less digits than its factorization.

3986509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22450.

The product of its (nonzero) digits is 58320, while the sum is 40.

The square root of 3986509 is about 1996.6244013334. The cubic root of 3986509 is about 158.5614406191.

The spelling of 3986509 in words is "three million, nine hundred eighty-six thousand, five hundred nine".