1001720 has 32 divisors (see below), whose sum is σ = 2289600. Its totient is φ = 394368.

The previous prime is 1001713. The next prime is 1001723. The reversal of 1001720 is 271001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001723) 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 7 ways as a sum of consecutive naturals, for example, 3002 + ... + 3318.

It is an arithmetic number, because the mean of its divisors is an integer number (71550).

2^1001720 is an apocalyptic number.

1001720 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 1001720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1144800).

1001720 is an abundant number, since it is smaller than the sum of its proper divisors (1287880).

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

1001720 is a wasteful number, since it uses less digits than its factorization.

1001720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 407 (or 403 counting only the distinct ones).

The product of its (nonzero) digits is 14, while the sum is 11.

The square root of 1001720 is about 1000.8596305177. The cubic root of 1001720 is about 100.0573004936.

Adding to 1001720 its reverse (271001), we get a palindrome (1272721).

The spelling of 1001720 in words is "one million, one thousand, seven hundred twenty".