13561040 has 40 divisors (see below), whose sum is σ = 31739040. Its totient is φ = 5388416.

The previous prime is 13561027. The next prime is 13561049. The reversal of 13561040 is 4016531.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13561049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13847 + ... + 14793.

It is an arithmetic number, because the mean of its divisors is an integer number (793476).

Almost surely, 2^13561040 is an apocalyptic number.

13561040 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 13561040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15869520).

13561040 is an abundant number, since it is smaller than the sum of its proper divisors (18178000).

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

13561040 is a wasteful number, since it uses less digits than its factorization.

13561040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1139 (or 1133 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 13561040 is about 3682.5317378130. The cubic root of 13561040 is about 238.4684884978.

Adding to 13561040 its reverse (4016531), we get a palindrome (17577571).

The spelling of 13561040 in words is "thirteen million, five hundred sixty-one thousand, forty".