13011540 has 24 divisors (see below), whose sum is σ = 36432480. Its totient is φ = 3469728.

The previous prime is 13011539. The next prime is 13011541. The reversal of 13011540 is 4511031.

It is an interprime number because it is at equal distance from previous prime (13011539) and next prime (13011541).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13011541) 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, 108370 + ... + 108489.

It is an arithmetic number, because the mean of its divisors is an integer number (1518020).

Almost surely, 2^13011540 is an apocalyptic number.

13011540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13011540 is an abundant number, since it is smaller than the sum of its proper divisors (23420940).

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

13011540 is a wasteful number, since it uses less digits than its factorization.

13011540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216871 (or 216869 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 13011540 is about 3607.1512305419. The cubic root of 13011540 is about 235.2030235855.

Adding to 13011540 its reverse (4511031), we get a palindrome (17522571).

The spelling of 13011540 in words is "thirteen million, eleven thousand, five hundred forty".