39944532409 has 32 divisors (see below), whose sum is σ = 46152270720. Its totient is φ = 34328613888.

The previous prime is 39944532389. The next prime is 39944532451. The reversal of 39944532409 is 90423544993.

It is a happy number.

It is not a de Polignac number, because 39944532409 - 2¹⁵ = 39944499641 is a prime.

It is a Smith number, since the sum of its digits (52) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (39944532499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1263139 + ... + 1294375.

It is an arithmetic number, because the mean of its divisors is an integer number (1442258460).

Almost surely, 2^39944532409 is an apocalyptic number.

It is an amenable number.

39944532409 is a deficient number, since it is larger than the sum of its proper divisors (6207738311).

39944532409 is a wasteful number, since it uses less digits than its factorization.

39944532409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31417.

The product of its (nonzero) digits is 4199040, while the sum is 52.

The spelling of 39944532409 in words is "thirty-nine billion, nine hundred forty-four million, five hundred thirty-two thousand, four hundred nine".