19968897 has 16 divisors (see below), whose sum is σ = 30360960. Its totient is φ = 11565312.

The previous prime is 19968889. The next prime is 19968911. The reversal of 19968897 is 79886991.

It is not a de Polignac number, because 19968897 - 2³ = 19968889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19968827) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14397 + ... + 15722.

It is an arithmetic number, because the mean of its divisors is an integer number (1897560).

Almost surely, 2^19968897 is an apocalyptic number.

19968897 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

19968897 is a deficient number, since it is larger than the sum of its proper divisors (10392063).

19968897 is a wasteful number, since it uses less digits than its factorization.

19968897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30152.

The product of its digits is 1959552, while the sum is 57.

The square root of 19968897 is about 4468.6571808542. The cubic root of 19968897 is about 271.3009777690.

It can be divided in two parts, 199 and 68897, that added together give a palindrome (69096).

The spelling of 19968897 in words is "nineteen million, nine hundred sixty-eight thousand, eight hundred ninety-seven".