189435909 has 16 divisors (see below), whose sum is σ = 286328000. Its totient is φ = 110439936.

The previous prime is 189435907. The next prime is 189435923. The reversal of 189435909 is 909534981.

It is not a de Polignac number, because 189435909 - 2¹ = 189435907 is a prime.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189435907) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 127084 + ... + 128565.

It is an arithmetic number, because the mean of its divisors is an integer number (17895500).

Almost surely, 2^189435909 is an apocalyptic number.

189435909 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

189435909 is a deficient number, since it is larger than the sum of its proper divisors (96892091).

189435909 is a wasteful number, since it uses less digits than its factorization.

189435909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255684.

The product of its (nonzero) digits is 349920, while the sum is 48.

The square root of 189435909 is about 13763.5718111252. The cubic root of 189435909 is about 574.3202139139.

The spelling of 189435909 in words is "one hundred eighty-nine million, four hundred thirty-five thousand, nine hundred nine".