1198817280 has 256 divisors, whose sum is σ = 4278124800. Its totient is φ = 318504960.

The previous prime is 1198817239. The next prime is 1198817281. The reversal of 1198817280 is 827188911.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (256).

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

It is not an unprimeable number, because it can be changed into a prime (1198817281) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4423545 + ... + 4423815.

It is an arithmetic number, because the mean of its divisors is an integer number (16711425).

Almost surely, 2^1198817280 is an apocalyptic number.

1198817280 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 1198817280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2139062400).

1198817280 is an abundant number, since it is smaller than the sum of its proper divisors (3079307520).

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

1198817280 is an frugal number, since it uses more digits than its factorization.

1198817280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315 (or 281 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 45.

The square root of 1198817280 is about 34623.9408502267. The cubic root of 1198817280 is about 1062.3093356607.

The spelling of 1198817280 in words is "one billion, one hundred ninety-eight million, eight hundred seventeen thousand, two hundred eighty".