189935903920 has 160 divisors (see below), whose sum is σ = 511084252800. Its totient is φ = 64297525248.

The previous prime is 189935903909. The next prime is 189935903977. The reversal of 189935903920 is 29309539981.

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, 41315062 + ... + 41319658.

It is an arithmetic number, because the mean of its divisors is an integer number (3194276580).

Almost surely, 2^189935903920 is an apocalyptic number.

189935903920 is a gapful number since it is divisible by the number (10) 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 189935903920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (255542126400).

189935903920 is an abundant number, since it is smaller than the sum of its proper divisors (321148348880).

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

189935903920 is a wasteful number, since it uses less digits than its factorization.

189935903920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5535 (or 5529 counting only the distinct ones).

The product of its (nonzero) digits is 4723920, while the sum is 58.

The spelling of 189935903920 in words is "one hundred eighty-nine billion, nine hundred thirty-five million, nine hundred three thousand, nine hundred twenty".