189819609 has 16 divisors (see below), whose sum is σ = 290626560. Its totient is φ = 107951760.

The previous prime is 189819601. The next prime is 189819611. The reversal of 189819609 is 906918981.

It is a happy number.

189819609 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 189819609 - 2³ = 189819601 is a prime.

It is not an unprimeable number, because it can be changed into a prime (189819601) 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, 16989 + ... + 25850.

It is an arithmetic number, because the mean of its divisors is an integer number (18164160).

Almost surely, 2^189819609 is an apocalyptic number.

It is an amenable number.

189819609 is a deficient number, since it is larger than the sum of its proper divisors (100806951).

189819609 is a wasteful number, since it uses less digits than its factorization.

189819609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43060.

The product of its (nonzero) digits is 279936, while the sum is 51.

The square root of 189819609 is about 13777.5037289053. The cubic root of 189819609 is about 574.7077118126.

The spelling of 189819609 in words is "one hundred eighty-nine million, eight hundred nineteen thousand, six hundred nine".