189409217 has 8 divisors (see below), whose sum is σ = 194756352. Its totient is φ = 184096800.

The previous prime is 189409183. The next prime is 189409243. The reversal of 189409217 is 712904981.

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

It is a cyclic number.

It is not a de Polignac number, because 189409217 - 2¹⁸ = 189147073 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189409267) 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, 2588 + ... + 19634.

It is an arithmetic number, because the mean of its divisors is an integer number (24344544).

Almost surely, 2^189409217 is an apocalyptic number.

It is an amenable number.

189409217 is a deficient number, since it is larger than the sum of its proper divisors (5347135).

189409217 is a wasteful number, since it uses less digits than its factorization.

189409217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17359.

The product of its (nonzero) digits is 36288, while the sum is 41.

The square root of 189409217 is about 13762.6021158791. The cubic root of 189409217 is about 574.2932382554.

The spelling of 189409217 in words is "one hundred eighty-nine million, four hundred nine thousand, two hundred seventeen".