1200031120 has 20 divisors (see below), whose sum is σ = 2790072540. Its totient is φ = 480012416.

The previous prime is 1200031081. The next prime is 1200031121. The reversal of 1200031120 is 211300021.

It can be written as a sum of positive squares in 2 ways, for example, as 127599616 + 1072431504 = 11296^2 + 32748^2 .

It is a tau number, because it is divible by the number of its divisors (20).

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 = 1200031097 and 1200031106.

It is not an unprimeable number, because it can be changed into a prime (1200031121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7500115 + ... + 7500274.

It is an arithmetic number, because the mean of its divisors is an integer number (139503627).

Almost surely, 2^1200031120 is an apocalyptic number.

1200031120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1200031120 is an abundant number, since it is smaller than the sum of its proper divisors (1590041420).

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

1200031120 is a wasteful number, since it uses less digits than its factorization.

1200031120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15000402 (or 15000396 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 1200031120 is about 34641.4653269748. The cubic root of 1200031120 is about 1062.6677551962.

Adding to 1200031120 its reverse (211300021), we get a palindrome (1411331141).

The spelling of 1200031120 in words is "one billion, two hundred million, thirty-one thousand, one hundred twenty".