189987936 has 48 divisors (see below), whose sum is σ = 502677504. Its totient is φ = 62826624.

The previous prime is 189987911. The next prime is 189987943. The reversal of 189987936 is 639789981.

189987936 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (48).

It is a self number, because there is not a number n which added to its sum of digits gives 189987936.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4401 + ... + 19983.

It is an arithmetic number, because the mean of its divisors is an integer number (10472448).

Almost surely, 2^189987936 is an apocalyptic number.

189987936 is a gapful number since it is divisible by the number (16) 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 189987936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (251338752).

189987936 is an abundant number, since it is smaller than the sum of its proper divisors (312689568).

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

189987936 is a wasteful number, since it uses less digits than its factorization.

189987936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15723 (or 15715 counting only the distinct ones).

The product of its digits is 5878656, while the sum is 60.

The square root of 189987936 is about 13783.6111378695. The cubic root of 189987936 is about 574.8775401467.

The spelling of 189987936 in words is "one hundred eighty-nine million, nine hundred eighty-seven thousand, nine hundred thirty-six".