39990446440 has 72 divisors (see below), whose sum is σ = 104692049910. Its totient is φ = 13707974784.

The previous prime is 39990446413. The next prime is 39990446471. The reversal of 39990446440 is 4464409993.

It can be written as a sum of positive squares in 3 ways, for example, as 5637306724 + 34353139716 = 75082^2 + 185346^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 8851062 + ... + 8855578.

Almost surely, 2^39990446440 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 39990446440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (52346024955).

39990446440 is an abundant number, since it is smaller than the sum of its proper divisors (64701603470).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

39990446440 is an frugal number, since it uses more digits than its factorization.

39990446440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9059 (or 4531 counting only the distinct ones).

The product of its (nonzero) digits is 3359232, while the sum is 52.

The spelling of 39990446440 in words is "thirty-nine billion, nine hundred ninety million, four hundred forty-six thousand, four hundred forty".