1001280 has 112 divisors (see below), whose sum is σ = 3657600. Its totient is φ = 227328.

The previous prime is 1001279. The next prime is 1001291. The reversal of 1001280 is 821001.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (112).

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6646 + ... + 6794.

2^1001280 is an apocalyptic number.

1001280 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 1001280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1828800).

1001280 is an abundant number, since it is smaller than the sum of its proper divisors (2656320).

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

1001280 is a wasteful number, since it uses less digits than its factorization.

1001280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176 (or 166 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 1001280 is about 1000.6397953310. The cubic root of 1001280 is about 100.0426484752.

Adding to 1001280 its reverse (821001), we get a palindrome (1822281).

The spelling of 1001280 in words is "one million, one thousand, two hundred eighty".