1312120403 has 16 divisors (see below), whose sum is σ = 1446157152. Its totient is φ = 1180608000.

The previous prime is 1312120393. The next prime is 1312120421. The reversal of 1312120403 is 3040212131.

It is not a de Polignac number, because 1312120403 - 2¹⁰ = 1312119379 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1312120463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 457193 + ... + 460053.

It is an arithmetic number, because the mean of its divisors is an integer number (90384822).

Almost surely, 2^1312120403 is an apocalyptic number.

1312120403 is a deficient number, since it is larger than the sum of its proper divisors (134036749).

1312120403 is a wasteful number, since it uses less digits than its factorization.

1312120403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3286.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 1312120403 is about 36223.2025502992. The cubic root of 1312120403 is about 1094.7742222658.

Adding to 1312120403 its reverse (3040212131), we get a palindrome (4352332534).

The spelling of 1312120403 in words is "one billion, three hundred twelve million, one hundred twenty thousand, four hundred three".