13641240 has 128 divisors (see below), whose sum is σ = 44697600. Its totient is φ = 3317760.

The previous prime is 13641239. The next prime is 13641263. The reversal of 13641240 is 4214631.

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, 70584 + ... + 70776.

It is an arithmetic number, because the mean of its divisors is an integer number (349200).

Almost surely, 2^13641240 is an apocalyptic number.

13641240 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 13641240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22348800).

13641240 is an abundant number, since it is smaller than the sum of its proper divisors (31056360).

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

13641240 is a wasteful number, since it uses less digits than its factorization.

13641240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257 (or 253 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 13641240 is about 3693.4049331207. The cubic root of 13641240 is about 238.9376657405.

Adding to 13641240 its reverse (4214631), we get a palindrome (17855871).

The spelling of 13641240 in words is "thirteen million, six hundred forty-one thousand, two hundred forty".