189135805 has 16 divisors (see below), whose sum is σ = 235865088. Its totient is φ = 145440000.

The previous prime is 189135763. The next prime is 189135811. The reversal of 189135805 is 508531981.

It is not a de Polignac number, because 189135805 - 2⁹ = 189135293 is a prime.

It is a Duffinian number.

It is a congruent 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 15 ways as a sum of consecutive naturals, for example, 19365 + ... + 27445.

It is an arithmetic number, because the mean of its divisors is an integer number (14741568).

Almost surely, 2^189135805 is an apocalyptic number.

It is an amenable number.

189135805 is a deficient number, since it is larger than the sum of its proper divisors (46729283).

189135805 is a wasteful number, since it uses less digits than its factorization.

189135805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8268.

The product of its (nonzero) digits is 43200, while the sum is 40.

The square root of 189135805 is about 13752.6653780276. The cubic root of 189135805 is about 574.0167746315.

The spelling of 189135805 in words is "one hundred eighty-nine million, one hundred thirty-five thousand, eight hundred five".