1280000 has 60 divisors (see below), whose sum is σ = 3198195. Its totient is φ = 512000.

The previous prime is 1279997. The next prime is 1280023. The reversal of 1280000 is 821.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 3 ways, for example, as 295936 + 984064 = 544^2 + 992^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=800.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 4 ways as a sum of consecutive naturals, for example, 255998 + ... + 256002.

2^1280000 is an apocalyptic number.

1280000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1280000

1280000 is an abundant number, since it is smaller than the sum of its proper divisors (1918195).

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

1280000 is an frugal number, since it uses more digits than its factorization.

1280000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42 (or 7 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 1280000 is about 1131.3708498985. The cubic root of 1280000 is about 108.5767046638.

Adding to 1280000 its reverse (821), we get a palindrome (1280821).

The spelling of 1280000 in words is "one million, two hundred eighty thousand".