11661712 has 40 divisors (see below), whose sum is σ = 23982840. Its totient is φ = 5483520.

The previous prime is 11661709. The next prime is 11661739. The reversal of 11661712 is 21716611.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 665856 + 10995856 = 816^2 + 3316^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18718 + ... + 19330.

It is an arithmetic number, because the mean of its divisors is an integer number (599571).

Almost surely, 2^11661712 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11661712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11991420).

11661712 is an abundant number, since it is smaller than the sum of its proper divisors (12321128).

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

11661712 is a wasteful number, since it uses less digits than its factorization.

11661712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 691 (or 685 counting only the distinct ones).

The product of its digits is 504, while the sum is 25.

The square root of 11661712 is about 3414.9248893643. The cubic root of 11661712 is about 226.7709593110.

The spelling of 11661712 in words is "eleven million, six hundred sixty-one thousand, seven hundred twelve".