19681875 has 30 divisors (see below), whose sum is σ = 35535500. Its totient is φ = 10494000.

The previous prime is 19681867. The next prime is 19681897. The reversal of 19681875 is 57818691.

It is not a de Polignac number, because 19681875 - 2³ = 19681867 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 19681875.

It is an unprimeable number.

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 29 ways as a sum of consecutive naturals, for example, 3876 + ... + 7374.

Almost surely, 2^19681875 is an apocalyptic number.

19681875 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

19681875 is a deficient number, since it is larger than the sum of its proper divisors (15853625).

19681875 is an equidigital number, since it uses as much as digits as its factorization.

19681875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3525 (or 3507 counting only the distinct ones).

The product of its digits is 120960, while the sum is 45.

The square root of 19681875 is about 4436.4259263511. The cubic root of 19681875 is about 269.9948558691.

The spelling of 19681875 in words is "nineteen million, six hundred eighty-one thousand, eight hundred seventy-five".