1312203400 has 24 divisors (see below), whose sum is σ = 3050873370. Its totient is φ = 524881280.

The previous prime is 1312203379. The next prime is 1312203419. The reversal of 1312203400 is 43022131.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 814645764 + 497557636 = 28542^2 + 22306^2 .

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 3280309 + ... + 3280708.

Almost surely, 2^1312203400 is an apocalyptic number.

1312203400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1312203400 is an abundant number, since it is smaller than the sum of its proper divisors (1738669970).

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

1312203400 is a wasteful number, since it uses less digits than its factorization.

1312203400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6561033 (or 6561024 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 1312203400 is about 36224.3481652879. The cubic root of 1312203400 is about 1094.7973047665.

Adding to 1312203400 its reverse (43022131), we get a palindrome (1355225531).

The spelling of 1312203400 in words is "one billion, three hundred twelve million, two hundred three thousand, four hundred".