11521440 has 240 divisors, whose sum is σ = 46835712. Its totient is φ = 2612736.

The previous prime is 11521421. The next prime is 11521453. The reversal of 11521440 is 4412511.

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 90657 + ... + 90783.

Almost surely, 2^11521440 is an apocalyptic number.

11521440 is a gapful number since it is divisible by the number (10) 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 11521440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23417856).

11521440 is an abundant number, since it is smaller than the sum of its proper divisors (35314272).

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

11521440 is a wasteful number, since it uses less digits than its factorization.

11521440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161 (or 144 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 11521440 is about 3394.3246751011. The cubic root of 11521440 is about 225.8580568997.

Adding to 11521440 its reverse (4412511), we get a palindrome (15933951).

The spelling of 11521440 in words is "eleven million, five hundred twenty-one thousand, four hundred forty".