13403203440 has 320 divisors, whose sum is σ = 47996928000. Its totient is φ = 3059942400.

The previous prime is 13403203439. The next prime is 13403203447. The reversal of 13403203440 is 4430230431.

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 13403203440.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13403203447) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 9579861 + ... + 9581259.

It is an arithmetic number, because the mean of its divisors is an integer number (149990400).

Almost surely, 2^13403203440 is an apocalyptic number.

13403203440 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 13403203440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23998464000).

13403203440 is an abundant number, since it is smaller than the sum of its proper divisors (34593724560).

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

13403203440 is a wasteful number, since it uses less digits than its factorization.

13403203440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1636 (or 1630 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 24.

Adding to 13403203440 its reverse (4430230431), we get a palindrome (17833433871).

The spelling of 13403203440 in words is "thirteen billion, four hundred three million, two hundred three thousand, four hundred forty".