1188422820 has 384 divisors, whose sum is σ = 4238868480. Its totient is φ = 274337280.

The previous prime is 1188422771. The next prime is 1188422831. The reversal of 1188422820 is 282248811.

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 9357597 + ... + 9357723.

It is an arithmetic number, because the mean of its divisors is an integer number (11038720).

Almost surely, 2^1188422820 is an apocalyptic number.

1188422820 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 1188422820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2119434240).

1188422820 is an abundant number, since it is smaller than the sum of its proper divisors (3050445660).

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

1188422820 is a wasteful number, since it uses less digits than its factorization.

1188422820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232 (or 224 counting only the distinct ones).

The product of its (nonzero) digits is 16384, while the sum is 36.

The square root of 1188422820 is about 34473.5089597795. The cubic root of 1188422820 is about 1059.2301340010.

The spelling of 1188422820 in words is "one billion, one hundred eighty-eight million, four hundred twenty-two thousand, eight hundred twenty".