1944444648 has 64 divisors (see below), whose sum is σ = 5139201600. Its totient is φ = 611366400.

The previous prime is 1944444613. The next prime is 1944444653. The reversal of 1944444648 is 8464444491.

It is a junction number, because it is equal to n+sod(n) for n = 1944444597 and 1944444606.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 97098 + ... + 115398.

It is an arithmetic number, because the mean of its divisors is an integer number (80300025).

Almost surely, 2^1944444648 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 1944444648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2569600800).

1944444648 is an abundant number, since it is smaller than the sum of its proper divisors (3194756952).

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

1944444648 is a wasteful number, since it uses less digits than its factorization.

1944444648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18562 (or 18558 counting only the distinct ones).

The product of its digits is 1769472, while the sum is 48.

The square root of 1944444648 is about 44095.8574925128. The cubic root of 1944444648 is about 1248.1454414241.

The spelling of 1944444648 in words is "one billion, nine hundred forty-four million, four hundred forty-four thousand, six hundred forty-eight".