189717197852 has 96 divisors (see below), whose sum is σ = 422675568000. Its totient is φ = 74024326656.

The previous prime is 189717197827. The next prime is 189717197867. The reversal of 189717197852 is 258791717981.

It is a happy number.

It is a Smith number, since the sum of its digits (65) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1229174 + ... + 1374882.

It is an arithmetic number, because the mean of its divisors is an integer number (4402870500).

Almost surely, 2^189717197852 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 189717197852, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (211337784000).

189717197852 is an abundant number, since it is smaller than the sum of its proper divisors (232958370148).

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

189717197852 is a wasteful number, since it uses less digits than its factorization.

189717197852 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145820 (or 145804 counting only the distinct ones).

The product of its digits is 17781120, while the sum is 65.

The spelling of 189717197852 in words is "one hundred eighty-nine billion, seven hundred seventeen million, one hundred ninety-seven thousand, eight hundred fifty-two".