721332 has 24 divisors (see below), whose sum is σ = 1870400. Its totient is φ = 240408.

The previous prime is 721321. The next prime is 721333. The reversal of 721332 is 233127.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 721332.

It is not an unprimeable number, because it can be changed into a prime (721333) 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, 3232 + ... + 3447.

2⁷²¹³³² is an apocalyptic number.

It is an amenable number.

721332 is an abundant number, since it is smaller than the sum of its proper divisors (1149068).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

721332 is a wasteful number, since it uses less digits than its factorization.

721332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6692 (or 6684 counting only the distinct ones).

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

The square root of 721332 is about 849.3126632754. The cubic root of 721332 is about 89.6833315411.

Adding to 721332 its reverse (233127), we get a palindrome (954459).

The spelling of 721332 in words is "seven hundred twenty-one thousand, three hundred thirty-two".