13220387 has 2 divisors, whose sum is σ = 13220388. Its totient is φ = 13220386.

The previous prime is 13220381. The next prime is 13220401. The reversal of 13220387 is 78302231.

13220387 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 13220387 - 2⁸ = 13220131 is a prime.

It is not a weakly prime, because it can be changed into another prime (13220381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6610193 + 6610194.

It is an arithmetic number, because the mean of its divisors is an integer number (6610194).

Almost surely, 2^13220387 is an apocalyptic number.

13220387 is a deficient number, since it is larger than the sum of its proper divisors (1).

13220387 is an equidigital number, since it uses as much as digits as its factorization.

13220387 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 13220387 is about 3635.9850109702. The cubic root of 13220387 is about 236.4547573050.

The spelling of 13220387 in words is "thirteen million, two hundred twenty thousand, three hundred eighty-seven".