39439013 has 4 divisors (see below), whose sum is σ = 39454380. Its totient is φ = 39423648.

The previous prime is 39438989. The next prime is 39439019. The reversal of 39439013 is 31093493.

39439013 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 37540129 + 1898884 = 6127^2 + 1378^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39439013 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39439019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2798 + ... + 9311.

It is an arithmetic number, because the mean of its divisors is an integer number (9863595).

Almost surely, 2^39439013 is an apocalyptic number.

It is an amenable number.

39439013 is a deficient number, since it is larger than the sum of its proper divisors (15367).

39439013 is a wasteful number, since it uses less digits than its factorization.

39439013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15366.

The product of its (nonzero) digits is 8748, while the sum is 32.

The square root of 39439013 is about 6280.0488055428. The cubic root of 39439013 is about 340.3888659174.

The spelling of 39439013 in words is "thirty-nine million, four hundred thirty-nine thousand, thirteen".