1312123200 has 84 divisors (see below), whose sum is σ = 4304873280. Its totient is φ = 349898240.

The previous prime is 1312123187. The next prime is 1312123207. The reversal of 1312123200 is 23212131.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 1312123200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312123207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 131880 + ... + 141479.

Almost surely, 2^1312123200 is an apocalyptic number.

1312123200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1312123200 is an abundant number, since it is smaller than the sum of its proper divisors (2992750080).

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

1312123200 is a wasteful number, since it uses less digits than its factorization.

1312123200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273384 (or 273369 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 1312123200 is about 36223.2411581294. The cubic root of 1312123200 is about 1094.7750001622.

Adding to 1312123200 its reverse (23212131), we get a palindrome (1335335331).

The spelling of 1312123200 in words is "one billion, three hundred twelve million, one hundred twenty-three thousand, two hundred".