19421856 has 120 divisors (see below), whose sum is σ = 58544640. Its totient is φ = 6314112.

The previous prime is 19421849. The next prime is 19421861. The reversal of 19421856 is 65812491.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 19421856.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 152865 + ... + 152991.

It is an arithmetic number, because the mean of its divisors is an integer number (487872).

Almost surely, 2^19421856 is an apocalyptic number.

19421856 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 19421856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29272320).

19421856 is an abundant number, since it is smaller than the sum of its proper divisors (39122784).

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

19421856 is a wasteful number, since it uses less digits than its factorization.

19421856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208 (or 191 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The square root of 19421856 is about 4407.0234853016. The cubic root of 19421856 is about 268.8006058660.

It can be divided in two parts, 19 and 421856, that added together give a cube (421875 = 75³).

The spelling of 19421856 in words is "nineteen million, four hundred twenty-one thousand, eight hundred fifty-six".