13641440 has 24 divisors (see below), whose sum is σ = 32228280. Its totient is φ = 5456512.

The previous prime is 13641431. The next prime is 13641499. The reversal of 13641440 is 4414631.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42470 + ... + 42789.

It is an arithmetic number, because the mean of its divisors is an integer number (1342845).

Almost surely, 2^13641440 is an apocalyptic number.

13641440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13641440 is an abundant number, since it is smaller than the sum of its proper divisors (18586840).

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

13641440 is an equidigital number, since it uses as much as digits as its factorization.

13641440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85274 (or 85266 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 13641440 is about 3693.4320083088. The cubic root of 13641440 is about 238.9388334570.

The spelling of 13641440 in words is "thirteen million, six hundred forty-one thousand, four hundred forty".