1287996 has 24 divisors (see below), whose sum is σ = 3027024. Its totient is φ = 426240.

The previous prime is 1287989. The next prime is 1287997. The reversal of 1287996 is 6997821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1287997) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1876 + ... + 2468.

It is an arithmetic number, because the mean of its divisors is an integer number (126126).

2^1287996 is an apocalyptic number.

It is an amenable number.

1287996 is an abundant number, since it is smaller than the sum of its proper divisors (1739028).

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

1287996 is a wasteful number, since it uses less digits than its factorization.

1287996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 781 (or 779 counting only the distinct ones).

The product of its digits is 54432, while the sum is 42.

The square root of 1287996 is about 1134.8991144591. The cubic root of 1287996 is about 108.8023238763.

The spelling of 1287996 in words is "one million, two hundred eighty-seven thousand, nine hundred ninety-six".