727721 has 4 divisors (see below), whose sum is σ = 730752. Its totient is φ = 724692.

The previous prime is 727717. The next prime is 727729. The reversal of 727721 is 127727.

727721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 727721 - 2² = 727717 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 727721.

It is not an unprimeable number, because it can be changed into a prime (727729) 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, 1121 + ... + 1646.

It is an arithmetic number, because the mean of its divisors is an integer number (182688).

2⁷²⁷⁷²¹ is an apocalyptic number.

It is an amenable number.

727721 is a deficient number, since it is larger than the sum of its proper divisors (3031).

727721 is a wasteful number, since it uses less digits than its factorization.

727721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3030.

The product of its digits is 1372, while the sum is 26.

The square root of 727721 is about 853.0656481186. The cubic root of 727721 is about 89.9473354439.

The spelling of 727721 in words is "seven hundred twenty-seven thousand, seven hundred twenty-one", and thus it is an iban number.