13680443 has 4 divisors (see below), whose sum is σ = 15634800. Its totient is φ = 11726088.

The previous prime is 13680439. The next prime is 13680479. The reversal of 13680443 is 34408631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34408631 = 37 ⋅929963.

It is a cyclic number.

It is not a de Polignac number, because 13680443 - 2² = 13680439 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13680643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 977168 + ... + 977181.

It is an arithmetic number, because the mean of its divisors is an integer number (3908700).

Almost surely, 2^13680443 is an apocalyptic number.

13680443 is a deficient number, since it is larger than the sum of its proper divisors (1954357).

13680443 is an equidigital number, since it uses as much as digits as its factorization.

13680443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1954356.

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 13680443 is about 3698.7082880379. The cubic root of 13680443 is about 239.1663378748.

The spelling of 13680443 in words is "thirteen million, six hundred eighty thousand, four hundred forty-three".