1287684 has 24 divisors (see below), whose sum is σ = 3338720. Its totient is φ = 429192.

The previous prime is 1287683. The next prime is 1287691. The reversal of 1287684 is 4867821.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nialpdrome in base 6.

It is not an unprimeable number, because it can be changed into a prime (1287683) 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, 5854 + ... + 6069.

2^1287684 is an apocalyptic number.

It is an amenable number.

1287684 is an abundant number, since it is smaller than the sum of its proper divisors (2051036).

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

1287684 is a wasteful number, since it uses less digits than its factorization.

1287684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11936 (or 11928 counting only the distinct ones).

The product of its digits is 21504, while the sum is 36.

The square root of 1287684 is about 1134.7616489818. The cubic root of 1287684 is about 108.7935378587.

The spelling of 1287684 in words is "one million, two hundred eighty-seven thousand, six hundred eighty-four".