721233 has 12 divisors (see below), whose sum is σ = 1051648. Its totient is φ = 476280.

The previous prime is 721229. The next prime is 721243. The reversal of 721233 is 332127.

It is not a de Polignac number, because 721233 - 2² = 721229 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 721233.

It is not an unprimeable number, because it can be changed into a prime (721213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 828 + ... + 1458.

2⁷²¹²³³ is an apocalyptic number.

It is an amenable number.

721233 is a deficient number, since it is larger than the sum of its proper divisors (330415).

721233 is a wasteful number, since it uses less digits than its factorization.

721233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 764 (or 761 counting only the distinct ones).

The product of its digits is 252, while the sum is 18.

The square root of 721233 is about 849.2543788524. The cubic root of 721233 is about 89.6792284577.

The spelling of 721233 in words is "seven hundred twenty-one thousand, two hundred thirty-three".