4399990820 has 12 divisors (see below), whose sum is σ = 9239980764. Its totient is φ = 1759996320.

The previous prime is 4399990801. The next prime is 4399990823. The reversal of 4399990820 is 280999934.

It can be written as a sum of positive squares in 2 ways, for example, as 1725239296 + 2674751524 = 41536^2 + 51718^2 .

It is not an unprimeable number, because it can be changed into a prime (4399990823) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 109999751 + ... + 109999790.

It is an arithmetic number, because the mean of its divisors is an integer number (769998397).

Almost surely, 2^4399990820 is an apocalyptic number.

It is an amenable number.

4399990820 is an abundant number, since it is smaller than the sum of its proper divisors (4839989944).

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

4399990820 is a wasteful number, since it uses less digits than its factorization.

4399990820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219999550 (or 219999548 counting only the distinct ones).

The product of its (nonzero) digits is 1259712, while the sum is 53.

The square root of 4399990820 is about 66332.4266102183. The cubic root of 4399990820 is about 1638.6414015991.

The spelling of 4399990820 in words is "four billion, three hundred ninety-nine million, nine hundred ninety thousand, eight hundred twenty".