13223649 has 4 divisors (see below), whose sum is σ = 17631536. Its totient is φ = 8815764.

The previous prime is 13223647. The next prime is 13223669. The reversal of 13223649 is 94632231.

13223649 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 94632231 = 3 ⋅31544077.

It is not a de Polignac number, because 13223649 - 2¹ = 13223647 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13223647) 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, 2203939 + ... + 2203944.

It is an arithmetic number, because the mean of its divisors is an integer number (4407884).

Almost surely, 2^13223649 is an apocalyptic number.

It is an amenable number.

13223649 is a deficient number, since it is larger than the sum of its proper divisors (4407887).

13223649 is an equidigital number, since it uses as much as digits as its factorization.

13223649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4407886.

The product of its digits is 7776, while the sum is 30.

The square root of 13223649 is about 3636.4335550096. The cubic root of 13223649 is about 236.4742033315.

The spelling of 13223649 in words is "thirteen million, two hundred twenty-three thousand, six hundred forty-nine".