19944999 has 12 divisors (see below), whose sum is σ = 28924896. Its totient is φ = 13243392.

The previous prime is 19944973. The next prime is 19945019. The reversal of 19944999 is 99944991.

19944999 is a `hidden beast` number, since 199 + 449 + 9 + 9 = 666.

It is not a de Polignac number, because 19944999 - 2⁹ = 19944487 is a prime.

It is a super-2 number, since 2×19944999² = 795605970220002, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19944299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1999 + ... + 6624.

It is an arithmetic number, because the mean of its divisors is an integer number (2410408).

Almost surely, 2^19944999 is an apocalyptic number.

19944999 is a deficient number, since it is larger than the sum of its proper divisors (8979897).

19944999 is a wasteful number, since it uses less digits than its factorization.

19944999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8886 (or 8883 counting only the distinct ones).

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

The square root of 19944999 is about 4465.9824227151. The cubic root of 19944999 is about 271.1927070767.

The spelling of 19944999 in words is "nineteen million, nine hundred forty-four thousand, nine hundred ninety-nine".