13403540 has 12 divisors (see below), whose sum is σ = 28147476. Its totient is φ = 5361408.

The previous prime is 13403519. The next prime is 13403567. The reversal of 13403540 is 4530431.

13403540 is nontrivially palindromic in base 9.

It can be written as a sum of positive squares in 2 ways, for example, as 3694084 + 9709456 = 1922^2 + 3116^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 670177 = 13403540 / (1 + 3 + 4 + 0 + 3 + 5 + 4 + 0).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 335069 + ... + 335108.

It is an arithmetic number, because the mean of its divisors is an integer number (2345623).

Almost surely, 2^13403540 is an apocalyptic number.

13403540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13403540 is an abundant number, since it is smaller than the sum of its proper divisors (14743936).

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

13403540 is a wasteful number, since it uses less digits than its factorization.

13403540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 670186 (or 670184 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 13403540 is about 3661.0845387672. The cubic root of 13403540 is about 237.5416879730.

Adding to 13403540 its reverse (4530431), we get a palindrome (17933971).

The spelling of 13403540 in words is "thirteen million, four hundred three thousand, five hundred forty".