1189738656 has 144 divisors (see below), whose sum is σ = 3648939840. Its totient is φ = 366474240.

The previous prime is 1189738651. The next prime is 1189738661. The reversal of 1189738656 is 6568379811.

It is an interprime number because it is at equal distance from previous prime (1189738651) and next prime (1189738661).

It is a tau number, because it is divible by the number of its divisors (144).

It is not an unprimeable number, because it can be changed into a prime (1189738651) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 221701 + ... + 227003.

It is an arithmetic number, because the mean of its divisors is an integer number (25339860).

Almost surely, 2^1189738656 is an apocalyptic number.

1189738656 is a gapful number since it is divisible by the number (16) 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 1189738656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1824469920).

1189738656 is an abundant number, since it is smaller than the sum of its proper divisors (2459201184).

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

1189738656 is a wasteful number, since it uses less digits than its factorization.

1189738656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5379 (or 5368 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 54.

The square root of 1189738656 is about 34492.5884212826. The cubic root of 1189738656 is about 1059.6209205781.

The spelling of 1189738656 in words is "one billion, one hundred eighty-nine million, seven hundred thirty-eight thousand, six hundred fifty-six".