13581540 has 96 divisors (see below), whose sum is σ = 48303360. Its totient is φ = 3103488.

The previous prime is 13581527. The next prime is 13581559. The reversal of 13581540 is 4518531.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1984 + ... + 5576.

It is an arithmetic number, because the mean of its divisors is an integer number (503160).

Almost surely, 2^13581540 is an apocalyptic number.

13581540 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 13581540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24151680).

13581540 is an abundant number, since it is smaller than the sum of its proper divisors (34721820).

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

13581540 is a wasteful number, since it uses less digits than its factorization.

13581540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3618 (or 3610 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The square root of 13581540 is about 3685.3140978755. The cubic root of 13581540 is about 238.5885909565.

The spelling of 13581540 in words is "thirteen million, five hundred eighty-one thousand, five hundred forty".