13440438 has 80 divisors (see below), whose sum is σ = 34786800. Its totient is φ = 3833280.

The previous prime is 13440437. The next prime is 13440461. The reversal of 13440438 is 83404431.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

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

It is a nialpdrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13440431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 790606 + ... + 790622.

It is an arithmetic number, because the mean of its divisors is an integer number (434835).

Almost surely, 2^13440438 is an apocalyptic number.

13440438 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 13440438, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17393400).

13440438 is an abundant number, since it is smaller than the sum of its proper divisors (21346362).

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

13440438 is an equidigital number, since it uses as much as digits as its factorization.

13440438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72 (or 33 counting only the distinct ones).

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

The square root of 13440438 is about 3666.1202926254. The cubic root of 13440438 is about 237.7594608581.

13440438 divided by its sum of digits (27) gives a palindrome (497794).

Adding to 13440438 its reverse (83404431), we get a palindrome (96844869).

The spelling of 13440438 in words is "thirteen million, four hundred forty thousand, four hundred thirty-eight".