39873109 has 4 divisors (see below), whose sum is σ = 42218604. Its totient is φ = 37527616.

The previous prime is 39873089. The next prime is 39873131. The reversal of 39873109 is 90137893.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90137893 = 17 ⋅5302229.

It can be written as a sum of positive squares in 2 ways, for example, as 28462225 + 11410884 = 5335^2 + 3378^2 .

It is a cyclic number.

It is not a de Polignac number, because 39873109 - 2⁹ = 39872597 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39873139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1172722 + ... + 1172755.

It is an arithmetic number, because the mean of its divisors is an integer number (10554651).

Almost surely, 2^39873109 is an apocalyptic number.

It is an amenable number.

39873109 is a deficient number, since it is larger than the sum of its proper divisors (2345495).

39873109 is a wasteful number, since it uses less digits than its factorization.

39873109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2345494.

The product of its (nonzero) digits is 40824, while the sum is 40.

The square root of 39873109 is about 6314.5157375685. The cubic root of 39873109 is about 341.6331719958.

The spelling of 39873109 in words is "thirty-nine million, eight hundred seventy-three thousand, one hundred nine".