19999224 has 80 divisors (see below), whose sum is σ = 64033200. Its totient is φ = 5712768.

The previous prime is 19999223. The next prime is 19999237. The reversal of 19999224 is 42299991.

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 19999224.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19999223) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2332 + ... + 6740.

It is an arithmetic number, because the mean of its divisors is an integer number (800415).

Almost surely, 2^19999224 is an apocalyptic number.

19999224 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 19999224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32016600).

19999224 is an abundant number, since it is smaller than the sum of its proper divisors (44033976).

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

19999224 is a wasteful number, since it uses less digits than its factorization.

19999224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4434 (or 4421 counting only the distinct ones).

The product of its digits is 104976, while the sum is 45.

The square root of 19999224 is about 4472.0491947205. The cubic root of 19999224 is about 271.4382509673.

The spelling of 19999224 in words is "nineteen million, nine hundred ninety-nine thousand, two hundred twenty-four".