724457 has 4 divisors (see below), whose sum is σ = 738180. Its totient is φ = 710736.

The previous prime is 724453. The next prime is 724459. The reversal of 724457 is 754427.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 534361 + 190096 = 731^2 + 436^2 .

It is a cyclic number.

It is not a de Polignac number, because 724457 - 2² = 724453 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (724453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6782 + ... + 6887.

It is an arithmetic number, because the mean of its divisors is an integer number (184545).

2⁷²⁴⁴⁵⁷ is an apocalyptic number.

It is an amenable number.

724457 is a deficient number, since it is larger than the sum of its proper divisors (13723).

724457 is a wasteful number, since it uses less digits than its factorization.

724457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13722.

The product of its digits is 7840, while the sum is 29.

The square root of 724457 is about 851.1503979909. The cubic root of 724457 is about 89.8126555610.

Subtracting from 724457 its product of digits (7840), we obtain a palindrome (716617).

The spelling of 724457 in words is "seven hundred twenty-four thousand, four hundred fifty-seven".