19897105 has 8 divisors (see below), whose sum is σ = 23911272. Its totient is φ = 15894528.

The previous prime is 19897079. The next prime is 19897109. The reversal of 19897105 is 50179891.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1096209 + 18800896 = 1047^2 + 4336^2 .

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 19897105 - 2⁹ = 19896593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19897109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1489 + ... + 6481.

It is an arithmetic number, because the mean of its divisors is an integer number (2988909).

Almost surely, 2^19897105 is an apocalyptic number.

It is an amenable number.

19897105 is a deficient number, since it is larger than the sum of its proper divisors (4014167).

19897105 is an equidigital number, since it uses as much as digits as its factorization.

19897105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5795.

The product of its (nonzero) digits is 22680, while the sum is 40.

The square root of 19897105 is about 4460.6171097730. The cubic root of 19897105 is about 270.9754610751.

It can be divided in two parts, 19897 and 105, that added together give a palindrome (20002).

The spelling of 19897105 in words is "nineteen million, eight hundred ninety-seven thousand, one hundred five".