13581140 has 24 divisors (see below), whose sum is σ = 28591080. Its totient is φ = 5419008.

The previous prime is 13581137. The next prime is 13581149. The reversal of 13581140 is 4118531.

It can be written as a sum of positive squares in 4 ways, for example, as 244036 + 13337104 = 494^2 + 3652^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13581149) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12956 + ... + 13964.

It is an arithmetic number, because the mean of its divisors is an integer number (1191295).

Almost surely, 2^13581140 is an apocalyptic number.

13581140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13581140 is an abundant number, since it is smaller than the sum of its proper divisors (15009940).

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

13581140 is a wasteful number, since it uses less digits than its factorization.

13581140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1691 (or 1689 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 13581140 is about 3685.2598280176. The cubic root of 13581140 is about 238.5862486504.

Adding to 13581140 its reverse (4118531), we get a palindrome (17699671).

The spelling of 13581140 in words is "thirteen million, five hundred eighty-one thousand, one hundred forty".