39928839 has 4 divisors (see below), whose sum is σ = 53238456. Its totient is φ = 26619224.

The previous prime is 39928817. The next prime is 39928841. The reversal of 39928839 is 93882993.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 39928839 - 2⁵ = 39928807 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 39928791 and 39928800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39928879) 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, 6654804 + ... + 6654809.

It is an arithmetic number, because the mean of its divisors is an integer number (13309614).

Almost surely, 2^39928839 is an apocalyptic number.

39928839 is a deficient number, since it is larger than the sum of its proper divisors (13309617).

39928839 is a wasteful number, since it uses less digits than its factorization.

39928839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13309616.

The product of its digits is 839808, while the sum is 51.

The square root of 39928839 is about 6318.9270449974. The cubic root of 39928839 is about 341.7922629535.

The spelling of 39928839 in words is "thirty-nine million, nine hundred twenty-eight thousand, eight hundred thirty-nine".