1231200000 has 540 divisors, whose sum is σ = 4830237720. Its totient is φ = 311040000.

The previous prime is 1231199987. The next prime is 1231200001. The reversal of 1231200000 is 21321.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (540).

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231200001) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 64799991 + ... + 64800009.

Almost surely, 2^1231200000 is an apocalyptic number.

1231200000 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 1231200000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2415118860).

1231200000 is an abundant number, since it is smaller than the sum of its proper divisors (3599037720).

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

1231200000 is an frugal number, since it uses more digits than its factorization.

1231200000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72 (or 29 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 1231200000 is about 35088.4596413123. The cubic root of 1231200000 is about 1071.7895926248.

Adding to 1231200000 its reverse (21321), we get a palindrome (1231221321).

The spelling of 1231200000 in words is "one billion, two hundred thirty-one million, two hundred thousand".