1127721 has 16 divisors (see below), whose sum is σ = 1741824. Its totient is φ = 635664.

The previous prime is 1127701. The next prime is 1127741. The reversal of 1127721 is 1277211.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1127701) and next prime (1127741).

It is not a de Polignac number, because 1127721 - 2⁶ = 1127657 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (1127701) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1420 + ... + 2066.

It is an arithmetic number, because the mean of its divisors is an integer number (108864).

2^1127721 is an apocalyptic number.

It is an amenable number.

1127721 is a deficient number, since it is larger than the sum of its proper divisors (614103).

1127721 is an equidigital number, since it uses as much as digits as its factorization.

1127721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 740.

The product of its digits is 196, while the sum is 21.

The square root of 1127721 is about 1061.9420888165. The cubic root of 1127721 is about 104.0879741313.

The spelling of 1127721 in words is "one million, one hundred twenty-seven thousand, seven hundred twenty-one".