1312203403 has 16 divisors (see below), whose sum is σ = 1584253440. Its totient is φ = 1061726400.

The previous prime is 1312203379. The next prime is 1312203419. The reversal of 1312203403 is 3043022131.

It is not a de Polignac number, because 1312203403 - 2¹⁷ = 1312072331 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is not an unprimeable number, because it can be changed into a prime (1312203493) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19818 + ... + 54928.

It is an arithmetic number, because the mean of its divisors is an integer number (99015840).

Almost surely, 2^1312203403 is an apocalyptic number.

1312203403 is a deficient number, since it is larger than the sum of its proper divisors (272050037).

1312203403 is a wasteful number, since it uses less digits than its factorization.

1312203403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35418.

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 1312203403 is about 36224.3482066966. The cubic root of 1312203403 is about 1094.7973056008.

Adding to 1312203403 its reverse (3043022131), we get a palindrome (4355225534).

The spelling of 1312203403 in words is "one billion, three hundred twelve million, two hundred three thousand, four hundred three".