1287431903 has 16 divisors (see below), whose sum is σ = 1318809600. Its totient is φ = 1256566080.

The previous prime is 1287431897. The next prime is 1287431921. The reversal of 1287431903 is 3091347821.

It is a de Polignac number, because none of the positive numbers 2^k-1287431903 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1287431993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3361250 + ... + 3361632.

It is an arithmetic number, because the mean of its divisors is an integer number (82425600).

Almost surely, 2^1287431903 is an apocalyptic number.

1287431903 is a deficient number, since it is larger than the sum of its proper divisors (31377697).

1287431903 is a wasteful number, since it uses less digits than its factorization.

1287431903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 862.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 1287431903 is about 35880.8013149093. The cubic root of 1287431903 is about 1087.8643769164.

The spelling of 1287431903 in words is "one billion, two hundred eighty-seven million, four hundred thirty-one thousand, nine hundred three".