1188280920 has 128 divisors (see below), whose sum is σ = 3663095040. Its totient is φ = 308206080.

The previous prime is 1188280897. The next prime is 1188280967. The reversal of 1188280920 is 290828811.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2172087 + ... + 2172633.

It is an arithmetic number, because the mean of its divisors is an integer number (28617930).

Almost surely, 2^1188280920 is an apocalyptic number.

1188280920 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 1188280920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1831547520).

1188280920 is an abundant number, since it is smaller than the sum of its proper divisors (2474814120).

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

1188280920 is a wasteful number, since it uses less digits than its factorization.

1188280920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1025 (or 1021 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 39.

The square root of 1188280920 is about 34471.4507962749. The cubic root of 1188280920 is about 1059.1879742757.

The spelling of 1188280920 in words is "one billion, one hundred eighty-eight million, two hundred eighty thousand, nine hundred twenty".