19959424 has 64 divisors (see below), whose sum is σ = 43452000. Its totient is φ = 9096192.

The previous prime is 19959409. The next prime is 19959431. The reversal of 19959424 is 42495991.

It is a tau number, because it is divible by the number of its divisors (64).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70387 + ... + 70669.

Almost surely, 2^19959424 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 19959424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21726000).

19959424 is an abundant number, since it is smaller than the sum of its proper divisors (23492576).

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

19959424 is a wasteful number, since it uses less digits than its factorization.

19959424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345 (or 333 counting only the distinct ones).

The product of its digits is 116640, while the sum is 43.

The square root of 19959424 is about 4467.5971170194. The cubic root of 19959424 is about 271.2580703638.

The spelling of 19959424 in words is "nineteen million, nine hundred fifty-nine thousand, four hundred twenty-four".