13031540 has 24 divisors (see below), whose sum is σ = 27556200. Its totient is φ = 5176448.

The previous prime is 13031539. The next prime is 13031561. The reversal of 13031540 is 4513031.

13031540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 258064 + 12773476 = 508^2 + 3574^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 794 + ... + 5166.

It is an arithmetic number, because the mean of its divisors is an integer number (1148175).

Almost surely, 2^13031540 is an apocalyptic number.

13031540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13031540 is an abundant number, since it is smaller than the sum of its proper divisors (14524660).

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

13031540 is a wasteful number, since it uses less digits than its factorization.

13031540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4531 (or 4529 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 13031540 is about 3609.9224368399. The cubic root of 13031540 is about 235.3234718525.

Adding to 13031540 its reverse (4513031), we get a palindrome (17544571).

The spelling of 13031540 in words is "thirteen million, thirty-one thousand, five hundred forty".