189912213 has 12 divisors (see below), whose sum is σ = 283777260. Its totient is φ = 122242176.

The previous prime is 189912187. The next prime is 189912223. The reversal of 189912213 is 312219981.

189912213 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 91068849 + 98843364 = 9543^2 + 9942^2 .

It is not a de Polignac number, because 189912213 - 2⁵ = 189912181 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189912223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 363556 + ... + 364077.

It is an arithmetic number, because the mean of its divisors is an integer number (23648105).

Almost surely, 2^189912213 is an apocalyptic number.

It is an amenable number.

189912213 is a deficient number, since it is larger than the sum of its proper divisors (93865047).

189912213 is a wasteful number, since it uses less digits than its factorization.

189912213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 727668 (or 727665 counting only the distinct ones).

The product of its digits is 7776, while the sum is 36.

The square root of 189912213 is about 13780.8640150028. The cubic root of 189912213 is about 574.8011541797.

The spelling of 189912213 in words is "one hundred eighty-nine million, nine hundred twelve thousand, two hundred thirteen".