721353 has 8 divisors (see below), whose sum is σ = 973728. Its totient is φ = 474944.

The previous prime is 721351. The next prime is 721363. The reversal of 721353 is 353127.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 721353 - 2¹ = 721351 is a prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 721353.

It is not an unprimeable number, because it can be changed into a prime (721351) 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, 1200 + ... + 1697.

It is an arithmetic number, because the mean of its divisors is an integer number (121716).

2⁷²¹³⁵³ is an apocalyptic number.

It is an amenable number.

721353 is a deficient number, since it is larger than the sum of its proper divisors (252375).

721353 is a wasteful number, since it uses less digits than its factorization.

721353 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2983.

The product of its digits is 630, while the sum is 21.

The square root of 721353 is about 849.3250261237. The cubic root of 721353 is about 89.6842018439.

The spelling of 721353 in words is "seven hundred twenty-one thousand, three hundred fifty-three".