1280320 has 28 divisors (see below), whose sum is σ = 3049524. Its totient is φ = 512000.

The previous prime is 1280317. The next prime is 1280333. The reversal of 1280320 is 230821.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 215296 + 1065024 = 464^2 + 1032^2 .

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 1280294 and 1280303.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1681 + ... + 2320.

2^1280320 is an apocalyptic number.

1280320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1280320 is an abundant number, since it is smaller than the sum of its proper divisors (1769204).

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

1280320 is an equidigital number, since it uses as much as digits as its factorization.

1280320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4018 (or 4008 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 1280320 is about 1131.5122624170. The cubic root of 1280320 is about 108.5857519686.

It can be divided in two parts, 1280 and 320, that multiplied together give a square (409600 = 640²).

The spelling of 1280320 in words is "one million, two hundred eighty thousand, three hundred twenty".