13391540 has 12 divisors (see below), whose sum is σ = 28122276. Its totient is φ = 5356608.

The previous prime is 13391531. The next prime is 13391549. The reversal of 13391540 is 4519331.

13391540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (13391531) and next prime (13391549).

It can be written as a sum of positive squares in 2 ways, for example, as 9872164 + 3519376 = 3142^2 + 1876^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13391549) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 334769 + ... + 334808.

It is an arithmetic number, because the mean of its divisors is an integer number (2343523).

Almost surely, 2^13391540 is an apocalyptic number.

13391540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13391540 is an abundant number, since it is smaller than the sum of its proper divisors (14730736).

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

13391540 is a wasteful number, since it uses less digits than its factorization.

13391540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 669586 (or 669584 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 26.

The square root of 13391540 is about 3659.4453131588. The cubic root of 13391540 is about 237.4707775680.

It can be divided in two parts, 13391 and 540, that added together give a palindrome (13931).

The spelling of 13391540 in words is "thirteen million, three hundred ninety-one thousand, five hundred forty".