18891443424 has 192 divisors, whose sum is σ = 61271078400. Its totient is φ = 4975147008.

The previous prime is 18891443423. The next prime is 18891443429. The reversal of 18891443424 is 42434419881.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18891443423) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 452422 + ... + 492410.

It is an arithmetic number, because the mean of its divisors is an integer number (319120200).

Almost surely, 2^18891443424 is an apocalyptic number.

18891443424 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18891443424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30635539200).

18891443424 is an abundant number, since it is smaller than the sum of its proper divisors (42379634976).

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

18891443424 is a wasteful number, since it uses less digits than its factorization.

18891443424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40065 (or 40057 counting only the distinct ones).

The product of its digits is 884736, while the sum is 48.

The spelling of 18891443424 in words is "eighteen billion, eight hundred ninety-one million, four hundred forty-three thousand, four hundred twenty-four".