39439445 has 4 divisors (see below), whose sum is σ = 47327340. Its totient is φ = 31551552.

The previous prime is 39439429. The next prime is 39439453. The reversal of 39439445 is 54493493.

39439445 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 30924721 + 8514724 = 5561^2 + 2918^2 .

It is a cyclic number.

It is not a de Polignac number, because 39439445 - 2⁴ = 39439429 is a prime.

It is a congruent number.

It is an unprimeable number.

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, 3943940 + ... + 3943949.

It is an arithmetic number, because the mean of its divisors is an integer number (11831835).

Almost surely, 2^39439445 is an apocalyptic number.

It is an amenable number.

39439445 is a deficient number, since it is larger than the sum of its proper divisors (7887895).

39439445 is an equidigital number, since it uses as much as digits as its factorization.

39439445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7887894.

The product of its digits is 233280, while the sum is 41.

The square root of 39439445 is about 6280.0832000858. The cubic root of 39439445 is about 340.3901087431.

The spelling of 39439445 in words is "thirty-nine million, four hundred thirty-nine thousand, four hundred forty-five".