189449280 has 140 divisors (see below), whose sum is σ = 673996620. Its totient is φ = 50512896.

The previous prime is 189449279. The next prime is 189449341. The reversal of 189449280 is 82944981.

189449280 is a `hidden beast` number, since 1 + 89 + 4 + 492 + 80 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 75898944 + 113550336 = 8712^2 + 10656^2 .

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 22266 + ... + 29574.

Almost surely, 2^189449280 is an apocalyptic number.

189449280 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 189449280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (336998310).

189449280 is an abundant number, since it is smaller than the sum of its proper divisors (484547340).

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

189449280 is an equidigital number, since it uses as much as digits as its factorization.

189449280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7338 (or 7319 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 45.

The square root of 189449280 is about 13764.0575412921. The cubic root of 189449280 is about 574.3337260563. Note that the first 3 decimals are identical.

It can be divided in two parts, 18944 and 9280, that added together give a square (28224 = 168²).

The spelling of 189449280 in words is "one hundred eighty-nine million, four hundred forty-nine thousand, two hundred eighty".