13643720 has 32 divisors (see below), whose sum is σ = 31691520. Its totient is φ = 5280960.

The previous prime is 13643719. The next prime is 13643723. The reversal of 13643720 is 2734631.

It is a self number, because there is not a number n which added to its sum of digits gives 13643720.

It is not an unprimeable number, because it can be changed into a prime (13643723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4262 + ... + 6741.

It is an arithmetic number, because the mean of its divisors is an integer number (990360).

Almost surely, 2^13643720 is an apocalyptic number.

13643720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13643720 is an abundant number, since it is smaller than the sum of its proper divisors (18047800).

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

13643720 is a wasteful number, since it uses less digits than its factorization.

13643720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11045 (or 11041 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 26.

The square root of 13643720 is about 3693.7406514264. The cubic root of 13643720 is about 238.9521446175.

The spelling of 13643720 in words is "thirteen million, six hundred forty-three thousand, seven hundred twenty".