189987968 has 16 divisors (see below), whose sum is σ = 378491910. Its totient is φ = 94993920.

The previous prime is 189987949. The next prime is 189987979. The reversal of 189987968 is 869789981.

It can be written as a sum of positive squares in only one way, i.e., 106667584 + 83320384 = 10328^2 + 9128^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 742013 + ... + 742268.

Almost surely, 2^189987968 is an apocalyptic number.

It is an amenable number.

189987968 is a deficient number, since it is larger than the sum of its proper divisors (188503942).

189987968 is an equidigital number, since it uses as much as digits as its factorization.

189987968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1484295 (or 1484283 counting only the distinct ones).

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

The square root of 189987968 is about 13783.6122986683. The cubic root of 189987968 is about 574.8775724226.

The spelling of 189987968 in words is "one hundred eighty-nine million, nine hundred eighty-seven thousand, nine hundred sixty-eight".