13220405 has 8 divisors (see below), whose sum is σ = 17306784. Its totient is φ = 9614800.

The previous prime is 13220401. The next prime is 13220411. The reversal of 13220405 is 50402231.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 13220405 - 2² = 13220401 is a prime.

It is a super-3 number, since 3×13220405³ (a number of 22 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13220401) 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 in 7 ways as a sum of consecutive naturals, for example, 120131 + ... + 120240.

It is an arithmetic number, because the mean of its divisors is an integer number (2163348).

Almost surely, 2^13220405 is an apocalyptic number.

It is an amenable number.

13220405 is a deficient number, since it is larger than the sum of its proper divisors (4086379).

13220405 is a wasteful number, since it uses less digits than its factorization.

13220405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240387.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 13220405 is about 3635.9874862271. The cubic root of 13220405 is about 236.4548646186.

Adding to 13220405 its reverse (50402231), we get a palindrome (63622636).

The spelling of 13220405 in words is "thirteen million, two hundred twenty thousand, four hundred five".