1305987287 has 8 divisors (see below), whose sum is σ = 1499698560. Its totient is φ = 1124773560.

The previous prime is 1305987283. The next prime is 1305987329. The reversal of 1305987287 is 7827895031.

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 1305987287 - 2² = 1305987283 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 (1305987283) 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 7 ways as a sum of consecutive naturals, for example, 3124163 + ... + 3124580.

It is an arithmetic number, because the mean of its divisors is an integer number (187462320).

Almost surely, 2^1305987287 is an apocalyptic number.

1305987287 is a deficient number, since it is larger than the sum of its proper divisors (193711273).

1305987287 is a wasteful number, since it uses less digits than its factorization.

1305987287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6248773.

The product of its (nonzero) digits is 846720, while the sum is 50.

The square root of 1305987287 is about 36138.4461066051. The cubic root of 1305987287 is about 1093.0658256921.

The spelling of 1305987287 in words is "one billion, three hundred five million, nine hundred eighty-seven thousand, two hundred eighty-seven".