189998280 has 96 divisors (see below), whose sum is σ = 619290360. Its totient is φ = 50519040.

The previous prime is 189998279. The next prime is 189998321. The reversal of 189998280 is 82899981.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 65318724 + 124679556 = 8082^2 + 11166^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 187054 + ... + 188066.

Almost surely, 2^189998280 is an apocalyptic number.

189998280 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 189998280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (309645180).

189998280 is an abundant number, since it is smaller than the sum of its proper divisors (429292080).

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

189998280 is a wasteful number, since it uses less digits than its factorization.

189998280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1551 (or 1544 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 54.

The square root of 189998280 is about 13783.9863609915. The cubic root of 189998280 is about 574.8879731343.

The spelling of 189998280 in words is "one hundred eighty-nine million, nine hundred ninety-eight thousand, two hundred eighty".