19968865 has 8 divisors (see below), whose sum is σ = 27385920. Its totient is φ = 13692912.

The previous prime is 19968827. The next prime is 19968869. The reversal of 19968865 is 56886991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19968865 - 2⁷ = 19968737 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19968869) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 285235 + ... + 285304.

It is an arithmetic number, because the mean of its divisors is an integer number (3423240).

Almost surely, 2^19968865 is an apocalyptic number.

It is an amenable number.

19968865 is a deficient number, since it is larger than the sum of its proper divisors (7417055).

19968865 is an equidigital number, since it uses as much as digits as its factorization.

19968865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 570551.

The product of its digits is 933120, while the sum is 52.

The square root of 19968865 is about 4468.6536003588. The cubic root of 19968865 is about 271.3008328497.

The spelling of 19968865 in words is "nineteen million, nine hundred sixty-eight thousand, eight hundred sixty-five".