11323123440 has 160 divisors (see below), whose sum is σ = 36342245376. Its totient is φ = 2914560000.

The previous prime is 11323123421. The next prime is 11323123447. The reversal of 11323123440 is 4432132311.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 11323123440.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11323123447) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 816565 + ... + 830315.

Almost surely, 2^11323123440 is an apocalyptic number.

11323123440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11323123440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18171122688).

11323123440 is an abundant number, since it is smaller than the sum of its proper divisors (25019121936).

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

11323123440 is a wasteful number, since it uses less digits than its factorization.

11323123440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13887 (or 13881 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 11323123440 its reverse (4432132311), we get a palindrome (15755255751).

The spelling of 11323123440 in words is "eleven billion, three hundred twenty-three million, one hundred twenty-three thousand, four hundred forty".