39724 has 6 divisors (see below), whose sum is σ = 69524. Its totient is φ = 19860.

The previous prime is 39719. The next prime is 39727. The reversal of 39724 is 42793.

39724 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a nialpdrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (39727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4962 + ... + 4969.

2³⁹⁷²⁴ is an apocalyptic number.

It is an amenable number.

39724 is a deficient number, since it is larger than the sum of its proper divisors (29800).

39724 is a wasteful number, since it uses less digits than its factorization.

39724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9935 (or 9933 counting only the distinct ones).

The product of its digits is 1512, while the sum is 25.

The square root of 39724 is about 199.3088056258. The cubic root of 39724 is about 34.1206784278.

The spelling of 39724 in words is "thirty-nine thousand, seven hundred twenty-four".