189443805 has 16 divisors (see below), whose sum is σ = 313562880. Its totient is φ = 97552448.

The previous prime is 189443797. The next prime is 189443843. The reversal of 189443805 is 508344981.

It is a cyclic number.

It is not a de Polignac number, because 189443805 - 2³ = 189443797 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 217317 + ... + 218186.

It is an arithmetic number, because the mean of its divisors is an integer number (19597680).

Almost surely, 2^189443805 is an apocalyptic number.

189443805 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

189443805 is a deficient number, since it is larger than the sum of its proper divisors (124119075).

189443805 is a wasteful number, since it uses less digits than its factorization.

189443805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435540.

The product of its (nonzero) digits is 138240, while the sum is 42.

The square root of 189443805 is about 13763.8586522821. The cubic root of 189443805 is about 574.3281933399.

The spelling of 189443805 in words is "one hundred eighty-nine million, four hundred forty-three thousand, eight hundred five".