1188689408 has 60 divisors (see below), whose sum is σ = 2428974372. Its totient is φ = 581145600.

The previous prime is 1188689407. The next prime is 1188689423. The reversal of 1188689408 is 8049868811.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1188689408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1188689407) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1130483 + ... + 1131533.

Almost surely, 2^1188689408 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1188689408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1214487186).

1188689408 is an abundant number, since it is smaller than the sum of its proper divisors (1240284964).

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

1188689408 is an frugal number, since it uses more digits than its factorization.

1188689408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1163 (or 1100 counting only the distinct ones).

The product of its (nonzero) digits is 884736, while the sum is 53.

The square root of 1188689408 is about 34477.3753061337. The cubic root of 1188689408 is about 1059.3093305424.

The spelling of 1188689408 in words is "one billion, one hundred eighty-eight million, six hundred eighty-nine thousand, four hundred eight".