189969505 has 16 divisors (see below), whose sum is σ = 261777600. Its totient is φ = 130887360.

The previous prime is 189969473. The next prime is 189969511. The reversal of 189969505 is 505969981.

It is not a de Polignac number, because 189969505 - 2⁵ = 189969473 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 89850 + ... + 91939.

It is an arithmetic number, because the mean of its divisors is an integer number (16361100).

Almost surely, 2^189969505 is an apocalyptic number.

It is an amenable number.

189969505 is a deficient number, since it is larger than the sum of its proper divisors (71808095).

189969505 is a wasteful number, since it uses less digits than its factorization.

189969505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181824.

The product of its (nonzero) digits is 874800, while the sum is 52.

The square root of 189969505 is about 13782.9425377892. The cubic root of 189969505 is about 574.8589496495.

The spelling of 189969505 in words is "one hundred eighty-nine million, nine hundred sixty-nine thousand, five hundred five".