189456321 has 8 divisors (see below), whose sum is σ = 252738144. Its totient is φ = 126239360.

The previous prime is 189456287. The next prime is 189456343. The reversal of 189456321 is 123654981.

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 189456321 - 2⁷ = 189456193 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 189456321.

It is not an unprimeable number, because it can be changed into a prime (189451321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8931 + ... + 21416.

It is an arithmetic number, because the mean of its divisors is an integer number (31592268).

Almost surely, 2^189456321 is an apocalyptic number.

It is an amenable number.

189456321 is a deficient number, since it is larger than the sum of its proper divisors (63281823).

189456321 is a wasteful number, since it uses less digits than its factorization.

189456321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32431.

The product of its digits is 51840, while the sum is 39.

The square root of 189456321 is about 13764.3133137836. The cubic root of 189456321 is about 574.3408411246.

The spelling of 189456321 in words is "one hundred eighty-nine million, four hundred fifty-six thousand, three hundred twenty-one".