1155219980 has 24 divisors (see below), whose sum is σ = 2430806112. Its totient is φ = 461165312.

The previous prime is 1155219971. The next prime is 1155220009. The reversal of 1155219980 is 899125511.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47357 + ... + 67476.

It is an arithmetic number, because the mean of its divisors is an integer number (101283588).

Almost surely, 2^1155219980 is an apocalyptic number.

1155219980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1155219980 is an abundant number, since it is smaller than the sum of its proper divisors (1275586132).

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

1155219980 is a wasteful number, since it uses less digits than its factorization.

1155219980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115345 (or 115343 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 41.

The square root of 1155219980 is about 33988.5271819772. The cubic root of 1155219980 is about 1049.2723545159.

The spelling of 1155219980 in words is "one billion, one hundred fifty-five million, two hundred nineteen thousand, nine hundred eighty".