1187446656 has 128 divisors (see below), whose sum is σ = 3460786560. Its totient is φ = 357754880.

The previous prime is 1187446649. The next prime is 1187446693. The reversal of 1187446656 is 6566447811.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 831415 + ... + 832841.

It is an arithmetic number, because the mean of its divisors is an integer number (27037395).

Almost surely, 2^1187446656 is an apocalyptic number.

1187446656 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 1187446656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1730393280).

1187446656 is an abundant number, since it is smaller than the sum of its proper divisors (2273339904).

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

1187446656 is a wasteful number, since it uses less digits than its factorization.

1187446656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1652 (or 1640 counting only the distinct ones).

The product of its digits is 967680, while the sum is 48.

The square root of 1187446656 is about 34459.3478754314. The cubic root of 1187446656 is about 1058.9400392808.

The spelling of 1187446656 in words is "one billion, one hundred eighty-seven million, four hundred forty-six thousand, six hundred fifty-six".