1200012220 has 96 divisors (see below), whose sum is σ = 2832532416. Its totient is φ = 423321600.

The previous prime is 1200012193. The next prime is 1200012221. The reversal of 1200012220 is 222100021.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 1200012197 and 1200012206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200012221) 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, 1130490 + ... + 1131550.

It is an arithmetic number, because the mean of its divisors is an integer number (29505546).

Almost surely, 2^1200012220 is an apocalyptic number.

1200012220 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 1200012220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1416266208).

1200012220 is an abundant number, since it is smaller than the sum of its proper divisors (1632520196).

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

1200012220 is a wasteful number, since it uses less digits than its factorization.

1200012220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1231 (or 1229 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 1200012220 is about 34641.1925314358. The cubic root of 1200012220 is about 1062.6621763058.

Adding to 1200012220 its reverse (222100021), we get a palindrome (1422112241).

It can be divided in two parts, 120001 and 2220, that added together give a palindrome (122221).

The spelling of 1200012220 in words is "one billion, two hundred million, twelve thousand, two hundred twenty".