19840256 has 36 divisors (see below), whose sum is σ = 41697600. Its totient is φ = 9395712.

The previous prime is 19840231. The next prime is 19840259. The reversal of 19840256 is 65204891.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19840259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2825 + ... + 6903.

Almost surely, 2^19840256 is an apocalyptic number.

19840256 is a gapful number since it is divisible by the number (16) 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 19840256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20848800).

19840256 is an abundant number, since it is smaller than the sum of its proper divisors (21857344).

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

19840256 is an equidigital number, since it uses as much as digits as its factorization.

19840256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4114 (or 4100 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 19840256 is about 4454.2402270196. The cubic root of 19840256 is about 270.7171424491.

The spelling of 19840256 in words is "nineteen million, eight hundred forty thousand, two hundred fifty-six".