1189396656 has 320 divisors, whose sum is σ = 4164812800. Its totient is φ = 317447424.

The previous prime is 1189396643. The next prime is 1189396667. The reversal of 1189396656 is 6566939811.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

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 63 ways as a sum of consecutive naturals, for example, 7296831 + ... + 7296993.

It is an arithmetic number, because the mean of its divisors is an integer number (13015040).

Almost surely, 2^1189396656 is an apocalyptic number.

1189396656 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 1189396656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2082406400).

1189396656 is an abundant number, since it is smaller than the sum of its proper divisors (2975416144).

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

1189396656 is a wasteful number, since it uses less digits than its factorization.

1189396656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333 (or 321 counting only the distinct ones).

The product of its digits is 2099520, while the sum is 54.

The square root of 1189396656 is about 34487.6304781874. The cubic root of 1189396656 is about 1059.5193786463.

The spelling of 1189396656 in words is "one billion, one hundred eighty-nine million, three hundred ninety-six thousand, six hundred fifty-six".