724013 has 4 divisors (see below), whose sum is σ = 766620. Its totient is φ = 681408.

The previous prime is 724007. The next prime is 724021. The reversal of 724013 is 310427.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 310427 = 13 ⋅23879.

It can be written as a sum of positive squares in 2 ways, for example, as 316969 + 407044 = 563^2 + 638^2 .

It is a cyclic number.

It is not a de Polignac number, because 724013 - 2⁴ = 723997 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 42589 = 724013 / (7 + 2 + 4 + 0 + 1 + 3).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 723982 and 724000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (724093) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21278 + ... + 21311.

It is an arithmetic number, because the mean of its divisors is an integer number (191655).

2⁷²⁴⁰¹³ is an apocalyptic number.

It is an amenable number.

724013 is a deficient number, since it is larger than the sum of its proper divisors (42607).

724013 is a wasteful number, since it uses less digits than its factorization.

724013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42606.

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

The square root of 724013 is about 850.8895345461. The cubic root of 724013 is about 89.7943038998.

The spelling of 724013 in words is "seven hundred twenty-four thousand, thirteen".