189781996 has 12 divisors (see below), whose sum is σ = 337748040. Its totient is φ = 93282560.

The previous prime is 189781981. The next prime is 189781997. The reversal of 189781996 is 699187981.

It is a self number, because there is not a number n which added to its sum of digits gives 189781996.

It is not an unprimeable number, because it can be changed into a prime (189781997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 401845 + ... + 402316.

It is an arithmetic number, because the mean of its divisors is an integer number (28145670).

Almost surely, 2^189781996 is an apocalyptic number.

It is an amenable number.

189781996 is a deficient number, since it is larger than the sum of its proper divisors (147966044).

189781996 is a wasteful number, since it uses less digits than its factorization.

189781996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 804224 (or 804222 counting only the distinct ones).

The product of its digits is 1959552, while the sum is 58.

The square root of 189781996 is about 13776.1386462245. The cubic root of 189781996 is about 574.6697496140.

The spelling of 189781996 in words is "one hundred eighty-nine million, seven hundred eighty-one thousand, nine hundred ninety-six".