19791872 has 36 divisors (see below), whose sum is σ = 39845736. Its totient is φ = 9830400.

The previous prime is 19791869. The next prime is 19791883. The reversal of 19791872 is 27819791.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130997 + ... + 131147.

It is an arithmetic number, because the mean of its divisors is an integer number (1106826).

Almost surely, 2^19791872 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19791872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19922868).

19791872 is an abundant number, since it is smaller than the sum of its proper divisors (20053864).

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

19791872 is an frugal number, since it uses more digits than its factorization.

19791872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185 (or 153 counting only the distinct ones).

The product of its digits is 63504, while the sum is 44.

The square root of 19791872 is about 4448.8056824276. The cubic root of 19791872 is about 270.4968993190.

The spelling of 19791872 in words is "nineteen million, seven hundred ninety-one thousand, eight hundred seventy-two".