189889853 has 4 divisors (see below), whose sum is σ = 190434300. Its totient is φ = 189345408.

The previous prime is 189889841. The next prime is 189889877. The reversal of 189889853 is 358988981.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 169078009 + 20811844 = 13003^2 + 4562^2 .

It is a cyclic number.

It is not a de Polignac number, because 189889853 - 2²⁰ = 188841277 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 189889792 and 189889801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189889153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 271700 + ... + 272397.

It is an arithmetic number, because the mean of its divisors is an integer number (47608575).

Almost surely, 2^189889853 is an apocalyptic number.

It is an amenable number.

189889853 is a deficient number, since it is larger than the sum of its proper divisors (544447).

189889853 is an equidigital number, since it uses as much as digits as its factorization.

189889853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 544446.

The product of its digits is 4976640, while the sum is 59.

The square root of 189889853 is about 13780.0527212344. The cubic root of 189889853 is about 574.7785945313.

The spelling of 189889853 in words is "one hundred eighty-nine million, eight hundred eighty-nine thousand, eight hundred fifty-three".