11271440 has 20 divisors (see below), whose sum is σ = 26206284. Its totient is φ = 4508544.

The previous prime is 11271439. The next prime is 11271467. The reversal of 11271440 is 4417211.

It can be written as a sum of positive squares in 2 ways, for example, as 7929856 + 3341584 = 2816^2 + 1828^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (20).

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 3 ways as a sum of consecutive naturals, for example, 70367 + ... + 70526.

Almost surely, 2^11271440 is an apocalyptic number.

11271440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11271440 is an abundant number, since it is smaller than the sum of its proper divisors (14934844).

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

11271440 is a wasteful number, since it uses less digits than its factorization.

11271440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140906 (or 140900 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 20.

The square root of 11271440 is about 3357.2965314372. The cubic root of 11271440 is about 224.2124896919.

Adding to 11271440 its reverse (4417211), we get a palindrome (15688651).

It can be divided in two parts, 11271 and 440, that added together give a palindrome (11711).

The spelling of 11271440 in words is "eleven million, two hundred seventy-one thousand, four hundred forty".