724405 has 8 divisors (see below), whose sum is σ = 948384. Its totient is φ = 526800.

The previous prime is 724403. The next prime is 724433. The reversal of 724405 is 504427.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 724405 - 2¹ = 724403 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (724403) 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 7 ways as a sum of consecutive naturals, for example, 6531 + ... + 6640.

It is an arithmetic number, because the mean of its divisors is an integer number (118548).

2⁷²⁴⁴⁰⁵ is an apocalyptic number.

It is an amenable number.

724405 is a deficient number, since it is larger than the sum of its proper divisors (223979).

724405 is a wasteful number, since it uses less digits than its factorization.

724405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13187.

The product of its (nonzero) digits is 1120, while the sum is 22.

The square root of 724405 is about 851.1198505499. The cubic root of 724405 is about 89.8105066551.

Adding to 724405 its sum of digits (22), we get a palindrome (724427).

The spelling of 724405 in words is "seven hundred twenty-four thousand, four hundred five".