39550439820 has 192 divisors, whose sum is σ = 122572154880. Its totient is φ = 9477844992.

The previous prime is 39550439749. The next prime is 39550439861. The reversal of 39550439820 is 2893405593.

It is a self number, because there is not a number n which added to its sum of digits gives 39550439820.

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 63 ways as a sum of consecutive naturals, for example, 17429646 + ... + 17431914.

It is an arithmetic number, because the mean of its divisors is an integer number (638396640).

Almost surely, 2^39550439820 is an apocalyptic number.

39550439820 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 39550439820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (61286077440).

39550439820 is an abundant number, since it is smaller than the sum of its proper divisors (83021715060).

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

39550439820 is a wasteful number, since it uses less digits than its factorization.

39550439820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3064 (or 3062 counting only the distinct ones).

The product of its (nonzero) digits is 1166400, while the sum is 48.

The spelling of 39550439820 in words is "thirty-nine billion, five hundred fifty million, four hundred thirty-nine thousand, eight hundred twenty".