39813 has 8 divisors (see below), whose sum is σ = 55488. Its totient is φ = 25344.

The previous prime is 39799. The next prime is 39821. The reversal of 39813 is 31893.

39813 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 39813 - 2⁶ = 39749 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39863) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 220 + ... + 357.

It is an arithmetic number, because the mean of its divisors is an integer number (6936).

2³⁹⁸¹³ is an apocalyptic number.

It is an amenable number.

39813 is a deficient number, since it is larger than the sum of its proper divisors (15675).

39813 is a wasteful number, since it uses less digits than its factorization.

39813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 603.

The product of its digits is 648, while the sum is 24.

The square root of 39813 is about 199.5319523284. The cubic root of 39813 is about 34.1461414166.

The spelling of 39813 in words is "thirty-nine thousand, eight hundred thirteen".