189987834 has 8 divisors (see below), whose sum is σ = 379975680. Its totient is φ = 63329276.

The previous prime is 189987827. The next prime is 189987851. The reversal of 189987834 is 438789981.

It is a sphenic number, since it is the product of 3 distinct primes.

189987834 is an admirable number.

It is a Curzon number.

It is an unprimeable number.

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, 15832314 + ... + 15832325.

It is an arithmetic number, because the mean of its divisors is an integer number (47496960).

Almost surely, 2^189987834 is an apocalyptic number.

189987834 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

189987834 is a wasteful number, since it uses less digits than its factorization.

189987834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31664644.

The product of its digits is 3483648, while the sum is 57.

The square root of 189987834 is about 13783.6074378227. The cubic root of 189987834 is about 574.8774372673.

The spelling of 189987834 in words is "one hundred eighty-nine million, nine hundred eighty-seven thousand, eight hundred thirty-four".