13266440 has 48 divisors (see below), whose sum is σ = 32821740. Its totient is φ = 4822400.

The previous prime is 13266439. The next prime is 13266467. The reversal of 13266440 is 4466231.

It can be written as a sum of positive squares in 2 ways, for example, as 12859396 + 407044 = 3586^2 + 638^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3470 + ... + 6210.

Almost surely, 2^13266440 is an apocalyptic number.

13266440 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 13266440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16410870).

13266440 is an abundant number, since it is smaller than the sum of its proper divisors (19555300).

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

13266440 is a wasteful number, since it uses less digits than its factorization.

13266440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2774 (or 2759 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 13266440 is about 3642.3124522753. The cubic root of 13266440 is about 236.7290011917.

The spelling of 13266440 in words is "thirteen million, two hundred sixty-six thousand, four hundred forty".