13323440 has 80 divisors (see below), whose sum is σ = 34872768. Its totient is φ = 4697088.

The previous prime is 13323433. The next prime is 13323451. The reversal of 13323440 is 4432331.

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 (20).

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 23642 + ... + 24198.

Almost surely, 2^13323440 is an apocalyptic number.

13323440 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 13323440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17436384).

13323440 is an abundant number, since it is smaller than the sum of its proper divisors (21549328).

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

13323440 is a wasteful number, since it uses less digits than its factorization.

13323440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 606 (or 600 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 20.

The square root of 13323440 is about 3650.1287648520. The cubic root of 13323440 is about 237.0675565690.

Adding to 13323440 its reverse (4432331), we get a palindrome (17755771).

The spelling of 13323440 in words is "thirteen million, three hundred twenty-three thousand, four hundred forty".