1220381512 has 64 divisors (see below), whose sum is σ = 2667479040. Its totient is φ = 512635200.

The previous prime is 1220381507. The next prime is 1220381521. The reversal of 1220381512 is 2151830221.

It is a super-2 number, since 2×1220381512² = 2978662069662812288, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 758613 + ... + 760219.

It is an arithmetic number, because the mean of its divisors is an integer number (41679360).

Almost surely, 2^1220381512 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1220381512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1333739520).

1220381512 is an abundant number, since it is smaller than the sum of its proper divisors (1447097528).

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

1220381512 is a wasteful number, since it uses less digits than its factorization.

1220381512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1882 (or 1878 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 1220381512 is about 34933.9592946462. The cubic root of 1220381512 is about 1068.6411002113.

The spelling of 1220381512 in words is "one billion, two hundred twenty million, three hundred eighty-one thousand, five hundred twelve".