13147440 has 80 divisors (see below), whose sum is σ = 42184800. Its totient is φ = 3383296.

The previous prime is 13147427. The next prime is 13147447. The reversal of 13147440 is 4474131.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 13147440.

It is not an unprimeable number, because it can be changed into a prime (13147447) 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, 6016 + ... + 7904.

It is an arithmetic number, because the mean of its divisors is an integer number (527310).

Almost surely, 2^13147440 is an apocalyptic number.

13147440 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 13147440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21092400).

13147440 is an abundant number, since it is smaller than the sum of its proper divisors (29037360).

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

13147440 is a wasteful number, since it uses less digits than its factorization.

13147440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1934 (or 1928 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 24.

The square root of 13147440 is about 3625.9398781557. The cubic root of 13147440 is about 236.0190542884.

The spelling of 13147440 in words is "thirteen million, one hundred forty-seven thousand, four hundred forty".