11561984 has 44 divisors (see below), whose sum is σ = 26430864. Its totient is φ = 4952064.

The previous prime is 11561971. The next prime is 11561999. The reversal of 11561984 is 48916511.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6362 + ... + 7974.

Almost surely, 2^11561984 is an apocalyptic number.

11561984 is a gapful number since it is divisible by the number (14) 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 11561984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13215432).

11561984 is an abundant number, since it is smaller than the sum of its proper divisors (14868880).

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

11561984 is an equidigital number, since it uses as much as digits as its factorization.

11561984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1640 (or 1622 counting only the distinct ones).

The product of its digits is 8640, while the sum is 35.

The square root of 11561984 is about 3400.2917521883. The cubic root of 11561984 is about 226.1226785850.

The spelling of 11561984 in words is "eleven million, five hundred sixty-one thousand, nine hundred eighty-four".