189903726972 has 72 divisors (see below), whose sum is σ = 488309683680. Its totient is φ = 62211726720.

The previous prime is 189903726931. The next prime is 189903727037. The reversal of 189903726972 is 279627309981.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2650354 + ... + 2721062.

It is an arithmetic number, because the mean of its divisors is an integer number (6782078940).

Almost surely, 2^189903726972 is an apocalyptic number.

189903726972 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 189903726972, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (244154841840).

189903726972 is an abundant number, since it is smaller than the sum of its proper divisors (298405956708).

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

189903726972 is a wasteful number, since it uses less digits than its factorization.

189903726972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72003 (or 71998 counting only the distinct ones).

The product of its (nonzero) digits is 20575296, while the sum is 63.

The spelling of 189903726972 in words is "one hundred eighty-nine billion, nine hundred three million, seven hundred twenty-six thousand, nine hundred seventy-two".