3987309 has 4 divisors (see below), whose sum is σ = 5316416. Its totient is φ = 2658204.

The previous prime is 3987301. The next prime is 3987311. The reversal of 3987309 is 9037893.

It is a happy number.

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.

It is not a de Polignac number, because 3987309 - 2³ = 3987301 is a prime.

It is a super-2 number, since 2×3987309² = 31797266122962, which contains 22 as substring.

It is an Ulam number.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3987301) 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, 664549 + ... + 664554.

It is an arithmetic number, because the mean of its divisors is an integer number (1329104).

Almost surely, 2^3987309 is an apocalyptic number.

It is an amenable number.

3987309 is a deficient number, since it is larger than the sum of its proper divisors (1329107).

3987309 is a wasteful number, since it uses less digits than its factorization.

3987309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1329106.

The product of its (nonzero) digits is 40824, while the sum is 39.

The square root of 3987309 is about 1996.8247294142. The cubic root of 3987309 is about 158.5720464456.

The spelling of 3987309 in words is "three million, nine hundred eighty-seven thousand, three hundred nine".