39961838004 has 72 divisors (see below), whose sum is σ = 102677740704. Its totient is φ = 12087662400.

The previous prime is 39961837997. The next prime is 39961838009. The reversal of 39961838004 is 40083816993.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39961838009) 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 23 ways as a sum of consecutive naturals, for example, 784059 + ... + 833469.

It is an arithmetic number, because the mean of its divisors is an integer number (1426079732).

Almost surely, 2^39961838004 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 39961838004, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51338870352).

39961838004 is an abundant number, since it is smaller than the sum of its proper divisors (62715902700).

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

39961838004 is a wasteful number, since it uses less digits than its factorization.

39961838004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49997 (or 49984 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 51.

The spelling of 39961838004 in words is "thirty-nine billion, nine hundred sixty-one million, eight hundred thirty-eight thousand, four".