721352 has 16 divisors (see below), whose sum is σ = 1389660. Its totient is φ = 350784.

The previous prime is 721351. The next prime is 721363. The reversal of 721352 is 253127.

It can be written as a sum of positive squares in 2 ways, for example, as 556516 + 164836 = 746^2 + 406^2 .

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 721352.

It is not an unprimeable number, because it can be changed into a prime (721351) 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 3 ways as a sum of consecutive naturals, for example, 923 + ... + 1514.

2⁷²¹³⁵² is an apocalyptic number.

It is an amenable number.

721352 is a deficient number, since it is larger than the sum of its proper divisors (668308).

721352 is a wasteful number, since it uses less digits than its factorization.

721352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2480 (or 2476 counting only the distinct ones).

The product of its digits is 420, while the sum is 20.

The square root of 721352 is about 849.3244374207. The cubic root of 721352 is about 89.6841604013.

Adding to 721352 its reverse (253127), we get a palindrome (974479).

It can be divided in two parts, 72 and 1352, that multiplied together give a square (97344 = 312²).

The spelling of 721352 in words is "seven hundred twenty-one thousand, three hundred fifty-two".