1287396871 has 8 divisors (see below), whose sum is σ = 1368718560. Its totient is φ = 1208187552.

The previous prime is 1287396863. The next prime is 1287396883. The reversal of 1287396871 is 1786937821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1287396871 - 2³ = 1287396863 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 (1287396371) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 526836 + ... + 529273.

It is an arithmetic number, because the mean of its divisors is an integer number (171089820).

Almost surely, 2^1287396871 is an apocalyptic number.

1287396871 is a deficient number, since it is larger than the sum of its proper divisors (81321689).

1287396871 is a wasteful number, since it uses less digits than its factorization.

1287396871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1056185.

The product of its digits is 1016064, while the sum is 52.

The square root of 1287396871 is about 35880.3131396592. The cubic root of 1287396871 is about 1087.8545096216.

The spelling of 1287396871 in words is "one billion, two hundred eighty-seven million, three hundred ninety-six thousand, eight hundred seventy-one".