19849856 has 64 divisors (see below), whose sum is σ = 43411200. Its totient is φ = 8985600.

The previous prime is 19849849. The next prime is 19849861. The reversal of 19849856 is 65894891.

It is a happy number.

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

It is a congruent number.

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, 131381 + ... + 131531.

It is an arithmetic number, because the mean of its divisors is an integer number (678300).

Almost surely, 2^19849856 is an apocalyptic number.

19849856 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 19849856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21705600).

19849856 is an abundant number, since it is smaller than the sum of its proper divisors (23561344).

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

19849856 is a wasteful number, since it uses less digits than its factorization.

19849856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257 (or 245 counting only the distinct ones).

The product of its digits is 622080, while the sum is 50.

The square root of 19849856 is about 4455.3177215548. The cubic root of 19849856 is about 270.7607989004.

The spelling of 19849856 in words is "nineteen million, eight hundred forty-nine thousand, eight hundred fifty-six".