39155944420 has 72 divisors (see below), whose sum is σ = 89776020600. Its totient is φ = 14326308864.

The previous prime is 39155944417. The next prime is 39155944459. The reversal of 39155944420 is 2444955193.

It can be written as a sum of positive squares in 4 ways, for example, as 8547742116 + 30608202304 = 92454^2 + 174952^2 .

It is an unprimeable number.

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, 115876 + ... + 302884.

It is an arithmetic number, because the mean of its divisors is an integer number (1246889175).

Almost surely, 2^39155944420 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 39155944420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44888010300).

39155944420 is an abundant number, since it is smaller than the sum of its proper divisors (50620076180).

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

39155944420 is a wasteful number, since it uses less digits than its factorization.

39155944420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187085 (or 187064 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 46.

The spelling of 39155944420 in words is "thirty-nine billion, one hundred fifty-five million, nine hundred forty-four thousand, four hundred twenty".