1287963 has 6 divisors (see below), whose sum is σ = 1860404. Its totient is φ = 858636.

The previous prime is 1287961. The next prime is 1287967. The reversal of 1287963 is 3697821.

It is not a de Polignac number, because 1287963 - 2¹ = 1287961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1287961) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 71545 + ... + 71562.

2^1287963 is an apocalyptic number.

1287963 is a deficient number, since it is larger than the sum of its proper divisors (572441).

1287963 is a wasteful number, since it uses less digits than its factorization.

1287963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143113 (or 143110 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 1287963 is about 1134.8845756287. The cubic root of 1287963 is about 108.8013946530.

The spelling of 1287963 in words is "one million, two hundred eighty-seven thousand, nine hundred sixty-three".