191985984 has 56 divisors (see below), whose sum is σ = 564408320. Its totient is φ = 63994752.

The previous prime is 191985977. The next prime is 191986001. The reversal of 191985984 is 489589191.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 191985984.

It is a congruent number.

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 in 7 ways as a sum of consecutive naturals, for example, 53824 + ... + 57279.

It is an arithmetic number, because the mean of its divisors is an integer number (10078720).

Almost surely, 2^191985984 is an apocalyptic number.

It is an amenable number.

191985984 is an abundant number, since it is smaller than the sum of its proper divisors (372422336).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

191985984 is a wasteful number, since it uses less digits than its factorization.

191985984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111124 (or 111108 counting only the distinct ones).

The product of its digits is 933120, while the sum is 54.

The square root of 191985984 is about 13855.9006924848. The cubic root of 191985984 is about 576.8857898855.

The spelling of 191985984 in words is "one hundred ninety-one million, nine hundred eighty-five thousand, nine hundred eighty-four".