13438440 has 128 divisors (see below), whose sum is σ = 46828800. Its totient is φ = 3421440.

The previous prime is 13438429. The next prime is 13438441. The reversal of 13438440 is 4483431.

13438440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (13438441) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24570 + ... + 25110.

It is an arithmetic number, because the mean of its divisors is an integer number (365850).

Almost surely, 2^13438440 is an apocalyptic number.

13438440 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 13438440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23414400).

13438440 is an abundant number, since it is smaller than the sum of its proper divisors (33390360).

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

13438440 is a wasteful number, since it uses less digits than its factorization.

13438440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 584 (or 574 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 13438440 is about 3665.8477873474. The cubic root of 13438440 is about 237.7476788278.

The spelling of 13438440 in words is "thirteen million, four hundred thirty-eight thousand, four hundred forty".