1287280 has 20 divisors (see below), whose sum is σ = 2993112. Its totient is φ = 514880.

The previous prime is 1287239. The next prime is 1287289. The reversal of 1287280 is 827821.

It is a tau number, because it is divible by the number of its divisors (20).

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1287289) 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, 7966 + ... + 8125.

2^1287280 is an apocalyptic number.

1287280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1287280 is an abundant number, since it is smaller than the sum of its proper divisors (1705832).

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

1287280 is a wasteful number, since it uses less digits than its factorization.

1287280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16104 (or 16098 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 28.

The square root of 1287280 is about 1134.5836240666. The cubic root of 1287280 is about 108.7821589835.

The spelling of 1287280 in words is "one million, two hundred eighty-seven thousand, two hundred eighty".