189478321 has 2 divisors, whose sum is σ = 189478322. Its totient is φ = 189478320.

The previous prime is 189478313. The next prime is 189478337. The reversal of 189478321 is 123874981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 189447696 + 30625 = 13764^2 + 175^2 .

It is a cyclic number.

It is not a de Polignac number, because 189478321 - 2³ = 189478313 is a prime.

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

It is not a weakly prime, because it can be changed into another prime (189478361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94739160 + 94739161.

It is an arithmetic number, because the mean of its divisors is an integer number (94739161).

Almost surely, 2^189478321 is an apocalyptic number.

It is an amenable number.

189478321 is a deficient number, since it is larger than the sum of its proper divisors (1).

189478321 is an equidigital number, since it uses as much as digits as its factorization.

189478321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96768, while the sum is 43.

The square root of 189478321 is about 13765.1124586761. The cubic root of 189478321 is about 574.3630714191.

The spelling of 189478321 in words is "one hundred eighty-nine million, four hundred seventy-eight thousand, three hundred twenty-one".