39609 has 12 divisors (see below), whose sum is σ = 59696. Its totient is φ = 26244.

The previous prime is 39607. The next prime is 39619. The reversal of 39609 is 90693.

It is not a de Polignac number, because 39609 - 2¹ = 39607 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

39609 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (39607) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 162 + ... + 324.

2³⁹⁶⁰⁹ is an apocalyptic number.

It is an amenable number.

39609 is a deficient number, since it is larger than the sum of its proper divisors (20087).

39609 is an equidigital number, since it uses as much as digits as its factorization.

39609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178 (or 166 counting only the distinct ones).

The product of its (nonzero) digits is 1458, while the sum is 27.

The square root of 39609 is about 199.0200994875. The cubic root of 39609 is about 34.0877204290.

It can be divided in two parts, 3960 and 9, that added together give a square (3969 = 63²).

The spelling of 39609 in words is "thirty-nine thousand, six hundred nine".