1230722220 has 216 divisors, whose sum is σ = 4342467024. Its totient is φ = 259564032.

The previous prime is 1230722201. The next prime is 1230722261. The reversal of 1230722220 is 222270321.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 495622 + ... + 498098.

It is an arithmetic number, because the mean of its divisors is an integer number (20104014).

Almost surely, 2^1230722220 is an apocalyptic number.

1230722220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1230722220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2171233512).

1230722220 is an abundant number, since it is smaller than the sum of its proper divisors (3111744804).

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

1230722220 is a wasteful number, since it uses less digits than its factorization.

1230722220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2529 (or 2507 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 1230722220 is about 35081.6507593357. The cubic root of 1230722220 is about 1071.6509349778.

Adding to 1230722220 its reverse (222270321), we get a palindrome (1452992541).

The spelling of 1230722220 in words is "one billion, two hundred thirty million, seven hundred twenty-two thousand, two hundred twenty".