39873 has 4 divisors (see below), whose sum is σ = 53168. Its totient is φ = 26580.

The previous prime is 39869. The next prime is 39877. The reversal of 39873 is 37893.

39873 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (39869) and next prime (39877).

It is not a de Polignac number, because 39873 - 2² = 39869 is a prime.

It is a super-2 number, since 2×39873² = 3179712258, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 39873.

It is not an unprimeable number, because it can be changed into a prime (39877) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6643 + ... + 6648.

It is an arithmetic number, because the mean of its divisors is an integer number (13292).

2³⁹⁸⁷³ is an apocalyptic number.

It is an amenable number.

39873 is a deficient number, since it is larger than the sum of its proper divisors (13295).

39873 is a wasteful number, since it uses less digits than its factorization.

39873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13294.

The product of its digits is 4536, while the sum is 30.

The square root of 39873 is about 199.6822475835. The cubic root of 39873 is about 34.1632860691.

Adding to 39873 its sum of digits (30), we get a triangular number (39903 = T₂₈₂).

The spelling of 39873 in words is "thirty-nine thousand, eight hundred seventy-three".