19988424 has 64 divisors (see below), whose sum is σ = 57456000. Its totient is φ = 6431040.

The previous prime is 19988411. The next prime is 19988429. The reversal of 19988424 is 42488991.

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 19988424.

It is not an unprimeable number, because it can be changed into a prime (19988429) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4669 + ... + 7859.

It is an arithmetic number, because the mean of its divisors is an integer number (897750).

Almost surely, 2^19988424 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19988424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28728000).

19988424 is an abundant number, since it is smaller than the sum of its proper divisors (37467576).

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

19988424 is a wasteful number, since it uses less digits than its factorization.

19988424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3235 (or 3225 counting only the distinct ones).

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

The square root of 19988424 is about 4470.8415315240. The cubic root of 19988424 is about 271.3893813884.

The spelling of 19988424 in words is "nineteen million, nine hundred eighty-eight thousand, four hundred twenty-four".