189115280 has 20 divisors (see below), whose sum is σ = 439693212. Its totient is φ = 75646080.

The previous prime is 189115279. The next prime is 189115307. The reversal of 189115280 is 82511981.

It can be written as a sum of positive squares in 2 ways, for example, as 25684624 + 163430656 = 5068^2 + 12784^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 189115280.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1181891 + ... + 1182050.

Almost surely, 2^189115280 is an apocalyptic number.

189115280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

189115280 is an abundant number, since it is smaller than the sum of its proper divisors (250577932).

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

189115280 is a wasteful number, since it uses less digits than its factorization.

189115280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2363954 (or 2363948 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 35.

The square root of 189115280 is about 13751.9191387966. The cubic root of 189115280 is about 573.9960097980.

It can be divided in two parts, 1891 and 15280, that added together give a palindrome (17171).

The spelling of 189115280 in words is "one hundred eighty-nine million, one hundred fifteen thousand, two hundred eighty".