1115721 has 24 divisors (see below), whose sum is σ = 1747680. Its totient is φ = 703080.

The previous prime is 1115713. The next prime is 1115731. The reversal of 1115721 is 1275111.

It is a happy number.

It is not a de Polignac number, because 1115721 - 2³ = 1115713 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1115694 and 1115703.

It is not an unprimeable number, because it can be changed into a prime (1115701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25926 + ... + 25968.

It is an arithmetic number, because the mean of its divisors is an integer number (72820).

2^1115721 is an apocalyptic number.

It is an amenable number.

1115721 is a deficient number, since it is larger than the sum of its proper divisors (631959).

1115721 is an equidigital number, since it uses as much as digits as its factorization.

1115721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114 (or 77 counting only the distinct ones).

The product of its digits is 70, while the sum is 18.

The square root of 1115721 is about 1056.2769523189. The cubic root of 1115721 is about 103.7174591904.

It can be divided in two parts, 111 and 5721, that added together give a cube (5832 = 18³).

The spelling of 1115721 in words is "one million, one hundred fifteen thousand, seven hundred twenty-one".