11311440 has 80 divisors (see below), whose sum is σ = 40080768. Its totient is φ = 2585088.

The previous prime is 11311397. The next prime is 11311453. The reversal of 11311440 is 4411311.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1687 + ... + 5046.

Almost surely, 2^11311440 is an apocalyptic number.

11311440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11311440 is an abundant number, since it is smaller than the sum of its proper divisors (28769328).

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

11311440 is a wasteful number, since it uses less digits than its factorization.

11311440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6756 (or 6750 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 11311440 is about 3363.2484297179. The cubic root of 11311440 is about 224.4774044186.

Adding to 11311440 its reverse (4411311), we get a palindrome (15722751).

The spelling of 11311440 in words is "eleven million, three hundred eleven thousand, four hundred forty".