1188166980 has 384 divisors, whose sum is σ = 4544741376. Its totient is φ = 223948800.

The previous prime is 1188166979. The next prime is 1188166997. The reversal of 1188166980 is 896618811.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 4384245 + ... + 4384515.

It is an arithmetic number, because the mean of its divisors is an integer number (11835264).

Almost surely, 2^1188166980 is an apocalyptic number.

1188166980 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 1188166980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2272370688).

1188166980 is an abundant number, since it is smaller than the sum of its proper divisors (3356574396).

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

1188166980 is a wasteful number, since it uses less digits than its factorization.

1188166980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387 (or 385 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 48.

The square root of 1188166980 is about 34469.7980847002. The cubic root of 1188166980 is about 1059.1541192803.

The spelling of 1188166980 in words is "one billion, one hundred eighty-eight million, one hundred sixty-six thousand, nine hundred eighty".