189209409 has 8 divisors (see below), whose sum is σ = 252365952. Its totient is φ = 126096240.

The previous prime is 189209393. The next prime is 189209443. The reversal of 189209409 is 904902981.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 189209409 - 2⁴ = 189209393 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (189209459) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1272 + ... + 19494.

It is an arithmetic number, because the mean of its divisors is an integer number (31545744).

Almost surely, 2^189209409 is an apocalyptic number.

It is an amenable number.

189209409 is a deficient number, since it is larger than the sum of its proper divisors (63156543).

189209409 is a wasteful number, since it uses less digits than its factorization.

189209409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21687.

The product of its (nonzero) digits is 46656, while the sum is 42.

The square root of 189209409 is about 13755.3411080932. The cubic root of 189209409 is about 574.0912263395.

The spelling of 189209409 in words is "one hundred eighty-nine million, two hundred nine thousand, four hundred nine".