189440280 has 48 divisors (see below), whose sum is σ = 615682080. Its totient is φ = 50517312.

The previous prime is 189440269. The next prime is 189440297. The reversal of 189440280 is 82044981.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 262752 + ... + 263471.

It is an arithmetic number, because the mean of its divisors is an integer number (12826710).

Almost surely, 2^189440280 is an apocalyptic number.

189440280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

189440280 is an abundant number, since it is smaller than the sum of its proper divisors (426241800).

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

189440280 is a wasteful number, since it uses less digits than its factorization.

189440280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 526240 (or 526233 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 189440280 is about 13763.7305989328. The cubic root of 189440280 is about 574.3246311235.

The spelling of 189440280 in words is "one hundred eighty-nine million, four hundred forty thousand, two hundred eighty".