13443840 has 144 divisors (see below), whose sum is σ = 47829600. Its totient is φ = 3575808.

The previous prime is 13443827. The next prime is 13443847. The reversal of 13443840 is 4834431.

It is a tau number, because it is divible by the number of its divisors (144).

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 (13443847) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34366 + ... + 34754.

It is an arithmetic number, because the mean of its divisors is an integer number (332150).

Almost surely, 2^13443840 is an apocalyptic number.

13443840 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 13443840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23914800).

13443840 is an abundant number, since it is smaller than the sum of its proper divisors (34385760).

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

13443840 is an equidigital number, since it uses as much as digits as its factorization.

13443840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 419 (or 399 counting only the distinct ones).

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

The square root of 13443840 is about 3666.5842414978. The cubic root of 13443840 is about 237.7795194665.

It can be divided in two parts, 1344 and 3840, that added together give a square (5184 = 72²).

The spelling of 13443840 in words is "thirteen million, four hundred forty-three thousand, eight hundred forty".