13420447 has 4 divisors (see below), whose sum is σ = 13429960. Its totient is φ = 13410936.

The previous prime is 13420397. The next prime is 13420453. The reversal of 13420447 is 74402431.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 74402431 = 1229 ⋅60539.

It is a cyclic number.

It is not a de Polignac number, because 13420447 - 2¹⁹ = 12896159 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13420487) 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, 2172 + ... + 5617.

It is an arithmetic number, because the mean of its divisors is an integer number (3357490).

Almost surely, 2^13420447 is an apocalyptic number.

13420447 is a deficient number, since it is larger than the sum of its proper divisors (9513).

13420447 is an equidigital number, since it uses as much as digits as its factorization.

13420447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9512.

The product of its (nonzero) digits is 2688, while the sum is 25.

The square root of 13420447 is about 3663.3928263292. The cubic root of 13420447 is about 237.6415230385.

Adding to 13420447 its reverse (74402431), we get a palindrome (87822878).

The spelling of 13420447 in words is "thirteen million, four hundred twenty thousand, four hundred forty-seven".