1220331000 has 128 divisors (see below), whose sum is σ = 4351426560. Its totient is φ = 278928000.

The previous prime is 1220330981. The next prime is 1220331001. The reversal of 1220331000 is 1330221.

It is a happy number.

It is a super-2 number, since 2×1220331000² = 2978415499122000000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220331001) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8056 + ... + 50055.

It is an arithmetic number, because the mean of its divisors is an integer number (33995520).

Almost surely, 2^1220331000 is an apocalyptic number.

1220331000 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 1220331000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2175713280).

1220331000 is an abundant number, since it is smaller than the sum of its proper divisors (3131095560).

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

1220331000 is a wasteful number, since it uses less digits than its factorization.

1220331000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58142 (or 58128 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 12.

The square root of 1220331000 is about 34933.2363230205. The cubic root of 1220331000 is about 1068.6263562034.

Adding to 1220331000 its reverse (1330221), we get a palindrome (1221661221).

The spelling of 1220331000 in words is "one billion, two hundred twenty million, three hundred thirty-one thousand".