11431440 has 60 divisors (see below), whose sum is σ = 38393004. Its totient is φ = 3048192.

The previous prime is 11431403. The next prime is 11431447. The reversal of 11431440 is 4413411.

It can be written as a sum of positive squares in 2 ways, for example, as 9072144 + 2359296 = 3012^2 + 1536^2 .

It is a tau number, because it is divible by the number of its divisors (60).

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

It is not an unprimeable number, because it can be changed into a prime (11431447) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 7219 + ... + 8658.

Almost surely, 2^11431440 is an apocalyptic number.

11431440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11431440 is an abundant number, since it is smaller than the sum of its proper divisors (26961564).

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

11431440 is a wasteful number, since it uses less digits than its factorization.

11431440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15896 (or 15887 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 11431440 is about 3381.0412597305. The cubic root of 11431440 is about 225.2684203934.

Adding to 11431440 its reverse (4413411), we get a palindrome (15844851).

The spelling of 11431440 in words is "eleven million, four hundred thirty-one thousand, four hundred forty".