1200001220 has 48 divisors (see below), whose sum is σ = 2761214400. Its totient is φ = 434440320.

The previous prime is 1200001193. The next prime is 1200001247. The reversal of 1200001220 is 221000021.

It is an interprime number because it is at equal distance from previous prime (1200001193) and next prime (1200001247).

It is a junction number, because it is equal to n+sod(n) for n = 1200001198 and 1200001207.

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, 38471 + ... + 62289.

It is an arithmetic number, because the mean of its divisors is an integer number (57525300).

Almost surely, 2^1200001220 is an apocalyptic number.

1200001220 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 1200001220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1380607200).

1200001220 is an abundant number, since it is smaller than the sum of its proper divisors (1561213180).

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

1200001220 is a wasteful number, since it uses less digits than its factorization.

1200001220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24068 (or 24066 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 8.

The square root of 1200001220 is about 34641.0337605563. The cubic root of 1200001220 is about 1062.6589293057.

Adding to 1200001220 its reverse (221000021), we get a palindrome (1421001241).

The spelling of 1200001220 in words is "one billion, two hundred million, one thousand, two hundred twenty".