19221384 has 96 divisors (see below), whose sum is σ = 59555520. Its totient is φ = 5061888.

The previous prime is 19221379. The next prime is 19221409. The reversal of 19221384 is 48312291.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28054 + ... + 28730.

It is an arithmetic number, because the mean of its divisors is an integer number (620370).

Almost surely, 2^19221384 is an apocalyptic number.

19221384 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 19221384, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29777760).

19221384 is an abundant number, since it is smaller than the sum of its proper divisors (40334136).

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

19221384 is a wasteful number, since it uses less digits than its factorization.

19221384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 719 (or 702 counting only the distinct ones).

The product of its digits is 3456, while the sum is 30.

The square root of 19221384 is about 4384.2198849966. The cubic root of 19221384 is about 267.8725539425.

The spelling of 19221384 in words is "nineteen million, two hundred twenty-one thousand, three hundred eighty-four".