4447039821 has 16 divisors (see below), whose sum is σ = 6811926528. Its totient is φ = 2527858800.

The previous prime is 4447039789. The next prime is 4447039837. The reversal of 4447039821 is 1289307444.

It is not a de Polignac number, because 4447039821 - 2⁵ = 4447039789 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4447039871) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 550345 + ... + 558366.

It is an arithmetic number, because the mean of its divisors is an integer number (425745408).

Almost surely, 2^4447039821 is an apocalyptic number.

It is an amenable number.

4447039821 is a deficient number, since it is larger than the sum of its proper divisors (2364886707).

4447039821 is a wasteful number, since it uses less digits than its factorization.

4447039821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1108912.

The product of its (nonzero) digits is 193536, while the sum is 42.

The square root of 4447039821 is about 66686.1291499214. The cubic root of 4447039821 is about 1644.4613580608.

The spelling of 4447039821 in words is "four billion, four hundred forty-seven million, thirty-nine thousand, eight hundred twenty-one".