1223154220 has 12 divisors (see below), whose sum is σ = 2568623904. Its totient is φ = 489261680.

The previous prime is 1223154217. The next prime is 1223154223. The reversal of 1223154220 is 224513221.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1223154217) and next prime (1223154223).

It is a super-2 number, since 2×1223154220² = 2992212491807616800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1223154191 and 1223154200.

It is not an unprimeable number, because it can be changed into a prime (1223154223) 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, 30578836 + ... + 30578875.

It is an arithmetic number, because the mean of its divisors is an integer number (214051992).

Almost surely, 2^1223154220 is an apocalyptic number.

1223154220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1223154220 is an abundant number, since it is smaller than the sum of its proper divisors (1345469684).

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

1223154220 is a wasteful number, since it uses less digits than its factorization.

1223154220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61157720 (or 61157718 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 1223154220 is about 34973.6217741314. The cubic root of 1223154220 is about 1069.4498059383.

Adding to 1223154220 its reverse (224513221), we get a palindrome (1447667441).

The spelling of 1223154220 in words is "one billion, two hundred twenty-three million, one hundred fifty-four thousand, two hundred twenty".