189881280 has 112 divisors (see below), whose sum is σ = 669889440. Its totient is φ = 50632704.

The previous prime is 189881267. The next prime is 189881281. The reversal of 189881280 is 82188981.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189881281) 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 15 ways as a sum of consecutive naturals, for example, 2349 + ... + 19628.

Almost surely, 2^189881280 is an apocalyptic number.

189881280 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 189881280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (334944720).

189881280 is an abundant number, since it is smaller than the sum of its proper divisors (480008160).

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

189881280 is a wasteful number, since it uses less digits than its factorization.

189881280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22003 (or 21987 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 45.

The square root of 189881280 is about 13779.7416521501. The cubic root of 189881280 is about 574.7699445148.

The spelling of 189881280 in words is "one hundred eighty-nine million, eight hundred eighty-one thousand, two hundred eighty".