189218910 has 64 divisors (see below), whose sum is σ = 494553600. Its totient is φ = 46150272.

The previous prime is 189218899. The next prime is 189218917. The reversal of 189218910 is 19812981.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189218917) 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 31 ways as a sum of consecutive naturals, for example, 10807 + ... + 22253.

It is an arithmetic number, because the mean of its divisors is an integer number (7727400).

Almost surely, 2^189218910 is an apocalyptic number.

189218910 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 189218910, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (247276800).

189218910 is an abundant number, since it is smaller than the sum of its proper divisors (305334690).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

189218910 is a wasteful number, since it uses less digits than its factorization.

189218910 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11505.

The product of its (nonzero) digits is 10368, while the sum is 39.

The square root of 189218910 is about 13755.6864605152. The cubic root of 189218910 is about 574.1008353568.

It can be divided in two parts, 1892 and 18910, that added together give a palindrome (20802).

The spelling of 189218910 in words is "one hundred eighty-nine million, two hundred eighteen thousand, nine hundred ten".