19783872 has 84 divisors (see below), whose sum is σ = 58709560. Its totient is φ = 6532992.

The previous prime is 19783871. The next prime is 19783873. The reversal of 19783872 is 27838791.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It is an interprime number because it is at equal distance from previous prime (19783871) and next prime (19783873).

Its product of digits (169344) is a multiple of the sum of its prime divisors (112).

It is not an unprimeable number, because it can be changed into a prime (19783871) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 184843 + ... + 184949.

Almost surely, 2^19783872 is an apocalyptic number.

19783872 is a gapful number since it is divisible by the number (12) 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 19783872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29354780).

19783872 is an abundant number, since it is smaller than the sum of its proper divisors (38925688).

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

19783872 is an equidigital number, since it uses as much as digits as its factorization.

19783872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235 (or 112 counting only the distinct ones).

The product of its digits is 169344, while the sum is 45.

The square root of 19783872 is about 4447.9064738369. The cubic root of 19783872 is about 270.4604488875.

The spelling of 19783872 in words is "nineteen million, seven hundred eighty-three thousand, eight hundred seventy-two".