1223205415 has 4 divisors (see below), whose sum is σ = 1467846504. Its totient is φ = 978564328.

The previous prime is 1223205407. The next prime is 1223205419. The reversal of 1223205415 is 5145023221.

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

It is a cyclic number.

It is not a de Polignac number, because 1223205415 - 2³ = 1223205407 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1223205415.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1223205419) 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 3 ways as a sum of consecutive naturals, for example, 122320537 + ... + 122320546.

It is an arithmetic number, because the mean of its divisors is an integer number (366961626).

Almost surely, 2^1223205415 is an apocalyptic number.

1223205415 is a deficient number, since it is larger than the sum of its proper divisors (244641089).

1223205415 is an equidigital number, since it uses as much as digits as its factorization.

1223205415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244641088.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 1223205415 is about 34974.3536752289. The cubic root of 1223205415 is about 1069.4647263024.

Adding to 1223205415 its reverse (5145023221), we get a palindrome (6368228636).

The spelling of 1223205415 in words is "one billion, two hundred twenty-three million, two hundred five thousand, four hundred fifteen".