1108721 has 4 divisors (see below), whose sum is σ = 1113600. Its totient is φ = 1103844.

The previous prime is 1108717. The next prime is 1108727. The reversal of 1108721 is 1278011.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1108721 - 2² = 1108717 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 = 1108693 and 1108702.

It is not an unprimeable number, because it can be changed into a prime (1108727) 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, 2081 + ... + 2558.

It is an arithmetic number, because the mean of its divisors is an integer number (278400).

2^1108721 is an apocalyptic number.

It is an amenable number.

1108721 is a deficient number, since it is larger than the sum of its proper divisors (4879).

1108721 is an equidigital number, since it uses as much as digits as its factorization.

1108721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4878.

The product of its (nonzero) digits is 112, while the sum is 20.

The square root of 1108721 is about 1052.9582137958. The cubic root of 1108721 is about 103.5000972406.

The spelling of 1108721 in words is "one million, one hundred eight thousand, seven hundred twenty-one".