721127 has 4 divisors (see below), whose sum is σ = 786696. Its totient is φ = 655560.

The previous prime is 721117. The next prime is 721129.

721127 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 721127 - 2⁴ = 721111 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 721099 and 721108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32768 + ... + 32789.

It is an arithmetic number, because the mean of its divisors is an integer number (196674).

2⁷²¹¹²⁷ is an apocalyptic number.

721127 is a deficient number, since it is larger than the sum of its proper divisors (65569).

721127 is a wasteful number, since it uses less digits than its factorization.

721127 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65568.

The product of its digits is 196, while the sum is 20.

The square root of 721127 is about 849.1919688739. The cubic root of 721127 is about 89.6748348411.

It can be divided in two parts, 721 and 127, that added together give a palindrome (848).

The spelling of 721127 in words is "seven hundred twenty-one thousand, one hundred twenty-seven", and thus it is an iban number.