13220385 has 16 divisors (see below), whose sum is σ = 21352896. Its totient is φ = 6984128.

The previous prime is 13220381. The next prime is 13220387. The reversal of 13220385 is 58302231.

It is a cyclic number.

It is not a de Polignac number, because 13220385 - 2² = 13220381 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13220381) 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 15 ways as a sum of consecutive naturals, for example, 2514 + ... + 5723.

It is an arithmetic number, because the mean of its divisors is an integer number (1334556).

Almost surely, 2^13220385 is an apocalyptic number.

13220385 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13220385 is a deficient number, since it is larger than the sum of its proper divisors (8132511).

13220385 is a wasteful number, since it uses less digits than its factorization.

13220385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8352.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 13220385 is about 3635.9847359416. The cubic root of 13220385 is about 236.4547453812.

The spelling of 13220385 in words is "thirteen million, two hundred twenty thousand, three hundred eighty-five".