1287463989 has 32 divisors (see below), whose sum is σ = 2035078144. Its totient is φ = 708704640.

The previous prime is 1287463979. The next prime is 1287463999. The reversal of 1287463989 is 9893647821.

It is an interprime number because it is at equal distance from previous prime (1287463979) and next prime (1287463999).

It is not a de Polignac number, because 1287463989 - 2⁹ = 1287463477 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 (1287463979) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 56154 + ... + 75684.

It is an arithmetic number, because the mean of its divisors is an integer number (63596192).

Almost surely, 2^1287463989 is an apocalyptic number.

It is an amenable number.

1287463989 is a deficient number, since it is larger than the sum of its proper divisors (747614155).

1287463989 is a wasteful number, since it uses less digits than its factorization.

1287463989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19657.

The product of its digits is 5225472, while the sum is 57.

The square root of 1287463989 is about 35881.2484314579. The cubic root of 1287463989 is about 1087.8734142686.

The spelling of 1287463989 in words is "one billion, two hundred eighty-seven million, four hundred sixty-three thousand, nine hundred eighty-nine".