1001320 has 16 divisors (see below), whose sum is σ = 2253060. Its totient is φ = 400512.

The previous prime is 1001311. The next prime is 1001321. The reversal of 1001320 is 231001.

It can be written as a sum of positive squares in 2 ways, for example, as 910116 + 91204 = 954^2 + 302^2 .

It is not an unprimeable number, because it can be changed into a prime (1001321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12477 + ... + 12556.

2^1001320 is an apocalyptic number.

1001320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1001320 is an abundant number, since it is smaller than the sum of its proper divisors (1251740).

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

1001320 is a wasteful number, since it uses less digits than its factorization.

1001320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25044 (or 25040 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 7.

The square root of 1001320 is about 1000.6597823436. The cubic root of 1001320 is about 100.0439806542.

Adding to 1001320 its reverse (231001), we get a palindrome (1232321).

The spelling of 1001320 in words is "one million, one thousand, three hundred twenty".