11123440 has 40 divisors (see below), whose sum is σ = 27386640. Its totient is φ = 4187136.

The previous prime is 11123393. The next prime is 11123471. The reversal of 11123440 is 4432111.

11123440 = T₁₃₉ + T₁₄₀ + ... + T₄₁₀.

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

It is a Harshad number since it is a multiple of its sum of digits (16).

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 7 ways as a sum of consecutive naturals, for example, 2730 + ... + 5449.

It is an arithmetic number, because the mean of its divisors is an integer number (684666).

Almost surely, 2^11123440 is an apocalyptic number.

11123440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11123440 is an abundant number, since it is smaller than the sum of its proper divisors (16263200).

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

11123440 is a wasteful number, since it uses less digits than its factorization.

11123440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8209 (or 8203 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 11123440 is about 3335.1821539460. The cubic root of 11123440 is about 223.2268198310.

Adding to 11123440 its reverse (4432111), we get a palindrome (15555551).

The spelling of 11123440 in words is "eleven million, one hundred twenty-three thousand, four hundred forty".