1287643126 has 16 divisors (see below), whose sum is σ = 2408060160. Its totient is φ = 501679080.

The previous prime is 1287643111. The next prime is 1287643139. The reversal of 1287643126 is 6213467821.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4180506 + ... + 4180813.

It is an arithmetic number, because the mean of its divisors is an integer number (150503760).

Almost surely, 2^1287643126 is an apocalyptic number.

1287643126 is a deficient number, since it is larger than the sum of its proper divisors (1120417034).

1287643126 is a wasteful number, since it uses less digits than its factorization.

1287643126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8361339.

The product of its digits is 96768, while the sum is 40.

The square root of 1287643126 is about 35883.7445927818. The cubic root of 1287643126 is about 1087.9238672893.

The spelling of 1287643126 in words is "one billion, two hundred eighty-seven million, six hundred forty-three thousand, one hundred twenty-six".