189968897 has 16 divisors (see below), whose sum is σ = 212284800. Its totient is φ = 168940800.

The previous prime is 189968893. The next prime is 189968921. The reversal of 189968897 is 798869981.

It is a cyclic number.

It is not a de Polignac number, because 189968897 - 2² = 189968893 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189968893) 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 15 ways as a sum of consecutive naturals, for example, 226004 + ... + 226842.

It is an arithmetic number, because the mean of its divisors is an integer number (13267800).

Almost surely, 2^189968897 is an apocalyptic number.

189968897 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

189968897 is a deficient number, since it is larger than the sum of its proper divisors (22315903).

189968897 is a wasteful number, since it uses less digits than its factorization.

189968897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1576.

The product of its digits is 15676416, while the sum is 65.

The square root of 189968897 is about 13782.9204815235. The cubic root of 189968897 is about 574.8583363675.

The spelling of 189968897 in words is "one hundred eighty-nine million, nine hundred sixty-eight thousand, eight hundred ninety-seven".