13226440 has 16 divisors (see below), whose sum is σ = 29759580. Its totient is φ = 5290560.

The previous prime is 13226419. The next prime is 13226467. The reversal of 13226440 is 4462231.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 11985444 + 1240996 = 3462^2 + 1114^2 .

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 3 ways as a sum of consecutive naturals, for example, 165291 + ... + 165370.

Almost surely, 2^13226440 is an apocalyptic number.

13226440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13226440 is an abundant number, since it is smaller than the sum of its proper divisors (16533140).

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

13226440 is a wasteful number, since it uses less digits than its factorization.

13226440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330672 (or 330668 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 13226440 is about 3636.8172898841. The cubic root of 13226440 is about 236.4908390088.

Adding to 13226440 its reverse (4462231), we get a palindrome (17688671).

The spelling of 13226440 in words is "thirteen million, two hundred twenty-six thousand, four hundred forty".