13220797 has 4 divisors (see below), whose sum is σ = 13470300. Its totient is φ = 12971296.

The previous prime is 13220773. The next prime is 13220843. The reversal of 13220797 is 79702231.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10830681 + 2390116 = 3291^2 + 1546^2 .

It is a cyclic number.

It is not a de Polignac number, because 13220797 - 2¹⁵ = 13188029 is a prime.

It is a super-3 number, since 3×13220797³ (a number of 22 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13220717) 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, 124672 + ... + 124777.

It is an arithmetic number, because the mean of its divisors is an integer number (3367575).

Almost surely, 2^13220797 is an apocalyptic number.

It is an amenable number.

13220797 is a deficient number, since it is larger than the sum of its proper divisors (249503).

13220797 is an equidigital number, since it uses as much as digits as its factorization.

13220797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249502.

The product of its (nonzero) digits is 5292, while the sum is 31.

The square root of 13220797 is about 3636.0413914036. The cubic root of 13220797 is about 236.4572016472.

The spelling of 13220797 in words is "thirteen million, two hundred twenty thousand, seven hundred ninety-seven".