1312321200 has 120 divisors (see below), whose sum is σ = 4214761488. Its totient is φ = 349040640.

The previous prime is 1312321177. The next prime is 1312321207. The reversal of 1312321200 is 21232131.

It is a tau number, because it is divible by the number of its divisors (120).

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 1312321200.

It is not an unprimeable number, because it can be changed into a prime (1312321207) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 547204 + ... + 549596.

Almost surely, 2^1312321200 is an apocalyptic number.

1312321200 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 1312321200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2107380744).

1312321200 is an abundant number, since it is smaller than the sum of its proper divisors (2902440288).

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

1312321200 is a wasteful number, since it uses less digits than its factorization.

1312321200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2871 (or 2860 counting only the distinct ones).

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

The square root of 1312321200 is about 36225.9741069857. The cubic root of 1312321200 is about 1094.8300647445.

Adding to 1312321200 its reverse (21232131), we get a palindrome (1333553331).

The spelling of 1312321200 in words is "one billion, three hundred twelve million, three hundred twenty-one thousand, two hundred".