721452 has 24 divisors (see below), whose sum is σ = 1713600. Its totient is φ = 236176.

The previous prime is 721451. The next prime is 721481. The reversal of 721452 is 254127.

It is an Ulam number.

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

It is not an unprimeable number, because it can be changed into a prime (721451) 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 7 ways as a sum of consecutive naturals, for example, 199 + ... + 1217.

It is an arithmetic number, because the mean of its divisors is an integer number (71400).

2⁷²¹⁴⁵² is an apocalyptic number.

It is an amenable number.

721452 is an abundant number, since it is smaller than the sum of its proper divisors (992148).

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

721452 is a wasteful number, since it uses less digits than its factorization.

721452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1085 (or 1083 counting only the distinct ones).

The product of its digits is 560, while the sum is 21.

The square root of 721452 is about 849.3833056989. The cubic root of 721452 is about 89.6883044722.

Adding to 721452 its reverse (254127), we get a palindrome (975579).

The spelling of 721452 in words is "seven hundred twenty-one thousand, four hundred fifty-two".