13223440 has 20 divisors (see below), whose sum is σ = 30744684. Its totient is φ = 5289344.

The previous prime is 13223437. The next prime is 13223461. The reversal of 13223440 is 4432231.

It can be written as a sum of positive squares in 2 ways, for example, as 8133904 + 5089536 = 2852^2 + 2256^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82567 + ... + 82726.

Almost surely, 2^13223440 is an apocalyptic number.

13223440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13223440 is an abundant number, since it is smaller than the sum of its proper divisors (17521244).

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

13223440 is a wasteful number, since it uses less digits than its factorization.

13223440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165306 (or 165300 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 13223440 is about 3636.4048179486. The cubic root of 13223440 is about 236.4729574987.

Adding to 13223440 its reverse (4432231), we get a palindrome (17655671).

The spelling of 13223440 in words is "thirteen million, two hundred twenty-three thousand, four hundred forty".