39936 has 44 divisors (see below), whose sum is σ = 114632. Its totient is φ = 12288.

The previous prime is 39929. The next prime is 39937. The reversal of 39936 is 63993.

Its product of digits (4374) is a multiple of the sum of its prime divisors (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39937) by changing a digit.

39936 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3066 + ... + 3078.

2³⁹⁹³⁶ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 39936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (57316).

39936 is an abundant number, since it is smaller than the sum of its proper divisors (74696).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

39936 is a wasteful number, since it uses less digits than its factorization.

39936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36 (or 18 counting only the distinct ones).

The product of its digits is 4374, while the sum is 30.

The square root of 39936 is about 199.8399359487. The cubic root of 39936 is about 34.1812694536.

It can be divided in two parts, 399 and 36, that added together give a triangular number (435 = T₂₉).

The spelling of 39936 in words is "thirty-nine thousand, nine hundred thirty-six".