1287916 has 18 divisors (see below), whose sum is σ = 2622228. Its totient is φ = 551880.

The previous prime is 1287899. The next prime is 1287917. The reversal of 1287916 is 6197821.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1287917) 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, 3090 + ... + 3481.

2^1287916 is an apocalyptic number.

It is an amenable number.

1287916 is an abundant number, since it is smaller than the sum of its proper divisors (1334312).

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

1287916 is a wasteful number, since it uses less digits than its factorization.

1287916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6589 (or 6580 counting only the distinct ones).

The product of its digits is 6048, while the sum is 34.

The square root of 1287916 is about 1134.8638684882. The cubic root of 1287916 is about 108.8000711865.

The spelling of 1287916 in words is "one million, two hundred eighty-seven thousand, nine hundred sixteen".