11543440 has 40 divisors (see below), whose sum is σ = 26982648. Its totient is φ = 4592640.

The previous prime is 11543437. The next prime is 11543443. The reversal of 11543440 is 4434511.

It is an interprime number because it is at equal distance from previous prime (11543437) and next prime (11543443).

It can be written as a sum of positive squares in 4 ways, for example, as 173056 + 11370384 = 416^2 + 3372^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (11543443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24810 + ... + 25270.

Almost surely, 2^11543440 is an apocalyptic number.

11543440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11543440 is an abundant number, since it is smaller than the sum of its proper divisors (15439208).

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

11543440 is a wasteful number, since it uses less digits than its factorization.

11543440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 787 (or 781 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 11543440 is about 3397.5638331016. The cubic root of 11543440 is about 226.0017229096.

Adding to 11543440 its reverse (4434511), we get a palindrome (15977951).

The spelling of 11543440 in words is "eleven million, five hundred forty-three thousand, four hundred forty".