1220302188 has 144 divisors (see below), whose sum is σ = 3657378816. Its totient is φ = 335819520.

The previous prime is 1220302183. The next prime is 1220302199. The reversal of 1220302188 is 8812030221.

It is not an unprimeable number, because it can be changed into a prime (1220302183) 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, 856845 + ... + 858267.

It is an arithmetic number, because the mean of its divisors is an integer number (25398464).

Almost surely, 2^1220302188 is an apocalyptic number.

1220302188 is a gapful number since it is divisible by the number (18) 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 1220302188, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1828689408).

1220302188 is an abundant number, since it is smaller than the sum of its proper divisors (2437076628).

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

1220302188 is a wasteful number, since it uses less digits than its factorization.

1220302188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1564 (or 1559 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 1220302188 is about 34932.8239339450. The cubic root of 1220302188 is about 1068.6179460521.

The spelling of 1220302188 in words is "one billion, two hundred twenty million, three hundred two thousand, one hundred eighty-eight".