721232 has 10 divisors (see below), whose sum is σ = 1397418. Its totient is φ = 360608.

The previous prime is 721229. The next prime is 721243. The reversal of 721232 is 232127.

It can be written as a sum of positive squares in only one way, i.e., 633616 + 87616 = 796^2 + 296^2 .

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 721232.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22523 + ... + 22554.

2⁷²¹²³² is an apocalyptic number.

It is an amenable number.

721232 is a deficient number, since it is larger than the sum of its proper divisors (676186).

721232 is a wasteful number, since it uses less digits than its factorization.

721232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45085 (or 45079 counting only the distinct ones).

The product of its digits is 168, while the sum is 17.

The square root of 721232 is about 849.2537901005. The cubic root of 721232 is about 89.6791870105.

Adding to 721232 its reverse (232127), we get a palindrome (953359).

The spelling of 721232 in words is "seven hundred twenty-one thousand, two hundred thirty-two".