13220437 has 2 divisors, whose sum is σ = 13220438. Its totient is φ = 13220436.

The previous prime is 13220419. The next prime is 13220461. The reversal of 13220437 is 73402231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12916836 + 303601 = 3594^2 + 551^2 .

It is a cyclic number.

It is not a de Polignac number, because 13220437 - 2⁷ = 13220309 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13223437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6610218 + 6610219.

It is an arithmetic number, because the mean of its divisors is an integer number (6610219).

Almost surely, 2^13220437 is an apocalyptic number.

It is an amenable number.

13220437 is a deficient number, since it is larger than the sum of its proper divisors (1).

13220437 is an equidigital number, since it uses as much as digits as its factorization.

13220437 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 22.

The square root of 13220437 is about 3635.9918866796. The cubic root of 13220437 is about 236.4550553982.

Adding to 13220437 its reverse (73402231), we get a palindrome (86622668).

The spelling of 13220437 in words is "thirteen million, two hundred twenty thousand, four hundred thirty-seven".