1280304 has 60 divisors (see below), whose sum is σ = 3801096. Its totient is φ = 400896.

The previous prime is 1280297. The next prime is 1280309. The reversal of 1280304 is 4030821.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (1280309) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2187 + ... + 2709.

2^1280304 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1280304, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1900548).

1280304 is an abundant number, since it is smaller than the sum of its proper divisors (2520792).

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

1280304 is a wasteful number, since it uses less digits than its factorization.

1280304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 554 (or 545 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 1280304 is about 1131.5051922108. The cubic root of 1280304 is about 108.5852996392.

The spelling of 1280304 in words is "one million, two hundred eighty thousand, three hundred four".