3909539 has 4 divisors (see below), whose sum is σ = 3931560. Its totient is φ = 3887520.

The previous prime is 3909533. The next prime is 3909547. The reversal of 3909539 is 9359093.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9359093 = 283 ⋅33071.

It is a cyclic number.

It is not a de Polignac number, because 3909539 - 2⁴ = 3909523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3909533) 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, 10742 + ... + 11099.

It is an arithmetic number, because the mean of its divisors is an integer number (982890).

Almost surely, 2^3909539 is an apocalyptic number.

3909539 is a deficient number, since it is larger than the sum of its proper divisors (22021).

3909539 is a wasteful number, since it uses less digits than its factorization.

3909539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22020.

The product of its (nonzero) digits is 32805, while the sum is 38.

The square root of 3909539 is about 1977.2554210319. The cubic root of 3909539 is about 157.5343202273.

The spelling of 3909539 in words is "three million, nine hundred nine thousand, five hundred thirty-nine".