721303 has 8 divisors (see below), whose sum is σ = 821376. Its totient is φ = 627000.

The previous prime is 721291. The next prime is 721307. The reversal of 721303 is 303127.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 721303 - 2⁹ = 720791 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721307) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1173 + ... + 1678.

It is an arithmetic number, because the mean of its divisors is an integer number (102672).

2⁷²¹³⁰³ is an apocalyptic number.

721303 is a deficient number, since it is larger than the sum of its proper divisors (100073).

721303 is a wasteful number, since it uses less digits than its factorization.

721303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2885.

The product of its (nonzero) digits is 126, while the sum is 16.

The square root of 721303 is about 849.2955904748. The cubic root of 721303 is about 89.6821296667.

It can be divided in two parts, 721 and 303, that added together give a 10-th power (1024 = 2¹⁰).

The spelling of 721303 in words is "seven hundred twenty-one thousand, three hundred three", and thus it is an iban number.