18843994999 has 8 divisors (see below), whose sum is σ = 19495476000. Its totient is φ = 18192626592.

The previous prime is 18843994993. The next prime is 18843995039. The reversal of 18843994999 is 99949934881.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18843994999 - 2³ = 18843994991 is a prime.

It is a super-2 number, since 2×18843994999² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18843994991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 450622 + ... + 490660.

It is an arithmetic number, because the mean of its divisors is an integer number (2436934500).

Almost surely, 2^18843994999 is an apocalyptic number.

18843994999 is a deficient number, since it is larger than the sum of its proper divisors (651481001).

18843994999 is a wasteful number, since it uses less digits than its factorization.

18843994999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56297.

The product of its digits is 181398528, while the sum is 73.

The spelling of 18843994999 in words is "eighteen billion, eight hundred forty-three million, nine hundred ninety-four thousand, nine hundred ninety-nine".