19999944 has 48 divisors (see below), whose sum is σ = 54447900. Its totient is φ = 6632064.

The previous prime is 19999927. The next prime is 19999963. The reversal of 19999944 is 44999991.

It can be written as a sum of positive squares in 2 ways, for example, as 19980900 + 19044 = 4470^2 + 138^2 .

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15882 + ... + 17094.

Almost surely, 2^19999944 is an apocalyptic number.

It is an amenable number.

19999944 is an abundant number, since it is smaller than the sum of its proper divisors (34447956).

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

19999944 is a wasteful number, since it uses less digits than its factorization.

19999944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1454 (or 1447 counting only the distinct ones).

The product of its digits is 944784, while the sum is 54.

The square root of 19999944 is about 4472.1296940049. The cubic root of 19999944 is about 271.4415083136.

The spelling of 19999944 in words is "nineteen million, nine hundred ninety-nine thousand, nine hundred forty-four".