19918241424 has 135 divisors (see below), whose sum is σ = 58926886083. Its totient is φ = 6279809472.

The previous prime is 19918241401. The next prime is 19918241429. The reversal of 19918241424 is 42414281991.

The square root of 19918241424 is 141132.

It is a perfect power (a square), and thus also a powerful number.

19918241424 is a `hidden beast` number, since 1 + 9 + 9 + 182 + 41 + 424 = 666.

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

It is a self number, because there is not a number n which added to its sum of digits gives 19918241424.

It is not an unprimeable number, because it can be changed into a prime (19918241429) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 32177787 + ... + 32178405.

Almost surely, 2^19918241424 is an apocalyptic number.

19918241424 is the 141132-nd square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19918241424

19918241424 is an abundant number, since it is smaller than the sum of its proper divisors (39008644659).

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

19918241424 is an equidigital number, since it uses as much as digits as its factorization.

19918241424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1290 (or 643 counting only the distinct ones).

The product of its digits is 165888, while the sum is 45.

The spelling of 19918241424 in words is "nineteen billion, nine hundred eighteen million, two hundred forty-one thousand, four hundred twenty-four".