19223840 has 48 divisors (see below), whose sum is σ = 45799992. Its totient is φ = 7624704.

The previous prime is 19223833. The next prime is 19223849. The reversal of 19223840 is 4832291.

It can be written as a sum of positive squares in 4 ways, for example, as 18215824 + 1008016 = 4268^2 + 1004^2 .

It is not an unprimeable number, because it can be changed into a prime (19223849) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21482 + ... + 22358.

Almost surely, 2^19223840 is an apocalyptic number.

19223840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a pronic number, being equal to 4384×4385.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19223840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22899996).

19223840 is an abundant number, since it is smaller than the sum of its proper divisors (26576152).

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

19223840 is a wasteful number, since it uses less digits than its factorization.

19223840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1029 (or 1021 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 19223840 is about 4384.4999714905. The cubic root of 19223840 is about 267.8839625378.

The spelling of 19223840 in words is "nineteen million, two hundred twenty-three thousand, eight hundred forty".