39564389 has 8 divisors (see below), whose sum is σ = 42041880. Its totient is φ = 37232448.

The previous prime is 39564373. The next prime is 39564391. The reversal of 39564389 is 98346593.

It can be written as a sum of positive squares in 4 ways, for example, as 12180100 + 27384289 = 3490^2 + 5233^2 .

It is not a de Polignac number, because 39564389 - 2⁴ = 39564373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39564319) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 887 + ... + 8939.

It is an arithmetic number, because the mean of its divisors is an integer number (5255235).

Almost surely, 2^39564389 is an apocalyptic number.

It is an amenable number.

39564389 is a deficient number, since it is larger than the sum of its proper divisors (2477491).

39564389 is an frugal number, since it uses more digits than its factorization.

39564389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8104 (or 8070 counting only the distinct ones).

The product of its digits is 699840, while the sum is 47.

The square root of 39564389 is about 6290.0229729310. The cubic root of 39564389 is about 340.7491813189.

The spelling of 39564389 in words is "thirty-nine million, five hundred sixty-four thousand, three hundred eighty-nine".