13223140 has 72 divisors (see below), whose sum is σ = 32864832. Its totient is φ = 4455360.

The previous prime is 13223123. The next prime is 13223173. The reversal of 13223140 is 4132231.

It is a happy number.

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 23 ways as a sum of consecutive naturals, for example, 100875 + ... + 101005.

It is an arithmetic number, because the mean of its divisors is an integer number (456456).

Almost surely, 2^13223140 is an apocalyptic number.

13223140 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 13223140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16432416).

13223140 is an abundant number, since it is smaller than the sum of its proper divisors (19641692).

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

13223140 is a wasteful number, since it uses less digits than its factorization.

13223140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257 (or 248 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 13223140 is about 3636.3635681818. The cubic root of 13223140 is about 236.4711691989.

Adding to 13223140 its reverse (4132231), we get a palindrome (17355371).

Subtracting from 13223140 its reverse (4132231), we obtain a palindrome (9090909).

The spelling of 13223140 in words is "thirteen million, two hundred twenty-three thousand, one hundred forty".