1220533530 has 64 divisors (see below), whose sum is σ = 3106729728. Its totient is φ = 305822720.

The previous prime is 1220533507. The next prime is 1220533549. The reversal of 1220533530 is 353350221.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1220533530.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 377320 + ... + 380540.

It is an arithmetic number, because the mean of its divisors is an integer number (48542652).

Almost surely, 2^1220533530 is an apocalyptic number.

1220533530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1220533530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1553364864).

1220533530 is an abundant number, since it is smaller than the sum of its proper divisors (1886196198).

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

1220533530 is a wasteful number, since it uses less digits than its factorization.

1220533530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3991.

The product of its (nonzero) digits is 2700, while the sum is 24.

The square root of 1220533530 is about 34936.1350180583. The cubic root of 1220533530 is about 1068.6854704721.

Adding to 1220533530 its reverse (353350221), we get a palindrome (1573883751).

The spelling of 1220533530 in words is "one billion, two hundred twenty million, five hundred thirty-three thousand, five hundred thirty".