1287984 has 20 divisors (see below), whose sum is σ = 3327416. Its totient is φ = 429312.

The previous prime is 1287983. The next prime is 1287989. The reversal of 1287984 is 4897821.

It is not an unprimeable number, because it can be changed into a prime (1287983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13369 + ... + 13464.

2^1287984 is an apocalyptic number.

It is an amenable number.

1287984 is an abundant number, since it is smaller than the sum of its proper divisors (2039432).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1287984 is a wasteful number, since it uses less digits than its factorization.

1287984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26844 (or 26838 counting only the distinct ones).

The product of its digits is 32256, while the sum is 39.

The square root of 1287984 is about 1134.8938276332. The cubic root of 1287984 is about 108.8019859787.

The spelling of 1287984 in words is "one million, two hundred eighty-seven thousand, nine hundred eighty-four".