3909609 has 48 divisors (see below), whose sum is σ = 6873984. Its totient is φ = 2112000.

The previous prime is 3909593. The next prime is 3909613. The reversal of 3909609 is 9069093.

It is not a de Polignac number, because 3909609 - 2⁴ = 3909593 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3909209) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 38659 + ... + 38759.

It is an arithmetic number, because the mean of its divisors is an integer number (143208).

Almost surely, 2^3909609 is an apocalyptic number.

It is an amenable number.

3909609 is a deficient number, since it is larger than the sum of its proper divisors (2964375).

3909609 is a wasteful number, since it uses less digits than its factorization.

3909609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158 (or 155 counting only the distinct ones).

The product of its (nonzero) digits is 13122, while the sum is 36.

The square root of 3909609 is about 1977.2731222570. The cubic root of 3909609 is about 157.5352604350.

It can be divided in two parts, 390 and 9609, that added together give a palindrome (9999).

The spelling of 3909609 in words is "three million, nine hundred nine thousand, six hundred nine".