1120721 has 8 divisors (see below), whose sum is σ = 1336704. Its totient is φ = 918720.

The previous prime is 1120711. The next prime is 1120723. The reversal of 1120721 is 1270211.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1120721 - 2¹⁰ = 1119697 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1120696 and 1120705.

It is not an unprimeable number, because it can be changed into a prime (1120723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3320 + ... + 3641.

It is an arithmetic number, because the mean of its divisors is an integer number (167088).

2^1120721 is an apocalyptic number.

It is an amenable number.

1120721 is a deficient number, since it is larger than the sum of its proper divisors (215983).

1120721 is an equidigital number, since it uses as much as digits as its factorization.

1120721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6991.

The product of its (nonzero) digits is 28, while the sum is 14.

The square root of 1120721 is about 1058.6411101029. The cubic root of 1120721 is about 103.8721617107.

Adding to 1120721 its reverse (1270211), we get a palindrome (2390932).

The spelling of 1120721 in words is "one million, one hundred twenty thousand, seven hundred twenty-one".