43920821900 has 72 divisors (see below), whose sum is σ = 98649883920. Its totient is φ = 16953027840.

The previous prime is 43920821899. The next prime is 43920821911. The reversal of 43920821900 is 912802934.

It is a super-2 number, since 2×43920821900² (a number of 22 digits) contains 22 as substring.

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, 7412339 + ... + 7418261.

Almost surely, 2^43920821900 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 43920821900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49324941960).

43920821900 is an abundant number, since it is smaller than the sum of its proper divisors (54729062020).

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

43920821900 is a wasteful number, since it uses less digits than its factorization.

43920821900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8523 (or 8516 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 38.

The spelling of 43920821900 in words is "forty-three billion, nine hundred twenty million, eight hundred twenty-one thousand, nine hundred".