1220123205 has 48 divisors (see below), whose sum is σ = 2522108160. Its totient is φ = 533516544.

The previous prime is 1220123183. The next prime is 1220123207. The reversal of 1220123205 is 5023210221.

It is not a de Polignac number, because 1220123205 - 2⁷ = 1220123077 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220123207) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 76960 + ... + 91449.

It is an arithmetic number, because the mean of its divisors is an integer number (52543920).

Almost surely, 2^1220123205 is an apocalyptic number.

1220123205 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1220123205 is an abundant number, since it is smaller than the sum of its proper divisors (1301984955).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1220123205 is a wasteful number, since it uses less digits than its factorization.

1220123205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168450 (or 168447 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 1220123205 is about 34930.2620230653. The cubic root of 1220123205 is about 1068.5656983931.

Adding to 1220123205 its reverse (5023210221), we get a palindrome (6243333426).

The spelling of 1220123205 in words is "one billion, two hundred twenty million, one hundred twenty-three thousand, two hundred five".