1287700387 has 2 divisors, whose sum is σ = 1287700388. Its totient is φ = 1287700386.

The previous prime is 1287700361. The next prime is 1287700441. The reversal of 1287700387 is 7830077821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1287700387 - 2⁷ = 1287700259 is a prime.

It is not a weakly prime, because it can be changed into another prime (1287700487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 643850193 + 643850194.

It is an arithmetic number, because the mean of its divisors is an integer number (643850194).

Almost surely, 2^1287700387 is an apocalyptic number.

1287700387 is a deficient number, since it is larger than the sum of its proper divisors (1).

1287700387 is an equidigital number, since it uses as much as digits as its factorization.

1287700387 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 131712, while the sum is 43.

The square root of 1287700387 is about 35884.5424521478. The cubic root of 1287700387 is about 1087.9399935705.

The spelling of 1287700387 in words is "one billion, two hundred eighty-seven million, seven hundred thousand, three hundred eighty-seven".