1223877217 has 4 divisors (see below), whose sum is σ = 1223958960. Its totient is φ = 1223795476.

The previous prime is 1223877211. The next prime is 1223877233. The reversal of 1223877217 is 7127783221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1223877217 - 2⁷ = 1223877089 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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 1223877217.

It is not an unprimeable number, because it can be changed into a prime (1223877211) 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, 11263 + ... + 50740.

It is an arithmetic number, because the mean of its divisors is an integer number (305989740).

Almost surely, 2^1223877217 is an apocalyptic number.

It is an amenable number.

1223877217 is a deficient number, since it is larger than the sum of its proper divisors (81743).

1223877217 is an equidigital number, since it uses as much as digits as its factorization.

1223877217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81742.

The product of its digits is 65856, while the sum is 40.

The square root of 1223877217 is about 34983.9565658317. The cubic root of 1223877217 is about 1069.6604789378.

The spelling of 1223877217 in words is "one billion, two hundred twenty-three million, eight hundred seventy-seven thousand, two hundred seventeen".