1188688640 has 144 divisors (see below), whose sum is σ = 3080471520. Its totient is φ = 437944320.

The previous prime is 1188688619. The next prime is 1188688643. The reversal of 1188688640 is 468868811.

1188688640 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (1188688643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 899180 + ... + 900500.

Almost surely, 2^1188688640 is an apocalyptic number.

1188688640 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 1188688640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1540235760).

1188688640 is an abundant number, since it is smaller than the sum of its proper divisors (1891782880).

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

1188688640 is a wasteful number, since it uses less digits than its factorization.

1188688640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1398 (or 1384 counting only the distinct ones).

The product of its (nonzero) digits is 589824, while the sum is 50.

The square root of 1188688640 is about 34477.3641683932. The cubic root of 1188688640 is about 1059.3091024060.

The spelling of 1188688640 in words is "one billion, one hundred eighty-eight million, six hundred eighty-eight thousand, six hundred forty".