19223940840 has 256 divisors, whose sum is σ = 65889331200. Its totient is φ = 4447872000.

The previous prime is 19223940797. The next prime is 19223940847. The reversal of 19223940840 is 4804932291.

It is a junction number, because it is equal to n+sod(n) for n = 19223940792 and 19223940801.

It is not an unprimeable number, because it can be changed into a prime (19223940847) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3880365 + ... + 3885315.

It is an arithmetic number, because the mean of its divisors is an integer number (257380200).

Almost surely, 2^19223940840 is an apocalyptic number.

19223940840 is a gapful number since it is divisible by the number (10) 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 19223940840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32944665600).

19223940840 is an abundant number, since it is smaller than the sum of its proper divisors (46665390360).

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

19223940840 is a wasteful number, since it uses less digits than its factorization.

19223940840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5128 (or 5124 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 42.

The spelling of 19223940840 in words is "nineteen billion, two hundred twenty-three million, nine hundred forty thousand, eight hundred forty".