1189787940 has 240 divisors, whose sum is σ = 4105442880. Its totient is φ = 286053120.

The previous prime is 1189787933. The next prime is 1189787957. The reversal of 1189787940 is 497879811.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 3189594 + ... + 3189966.

It is an arithmetic number, because the mean of its divisors is an integer number (17106012).

Almost surely, 2^1189787940 is an apocalyptic number.

1189787940 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 1189787940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2052721440).

1189787940 is an abundant number, since it is smaller than the sum of its proper divisors (2915654940).

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

1189787940 is a wasteful number, since it uses less digits than its factorization.

1189787940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 584 (or 573 counting only the distinct ones).

The product of its (nonzero) digits is 1016064, while the sum is 54.

The square root of 1189787940 is about 34493.3028282303. The cubic root of 1189787940 is about 1059.6355517007.

The spelling of 1189787940 in words is "one billion, one hundred eighty-nine million, seven hundred eighty-seven thousand, nine hundred forty".