724145 has 4 divisors (see below), whose sum is σ = 868980. Its totient is φ = 579312.

The previous prime is 724123. The next prime is 724153. The reversal of 724145 is 541427.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 541427 = 67 ⋅8081.

It can be written as a sum of positive squares in 2 ways, for example, as 204304 + 519841 = 452^2 + 721^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-724145 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 724145.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72410 + ... + 72419.

It is an arithmetic number, because the mean of its divisors is an integer number (217245).

2⁷²⁴¹⁴⁵ is an apocalyptic number.

It is an amenable number.

724145 is a deficient number, since it is larger than the sum of its proper divisors (144835).

724145 is a wasteful number, since it uses less digits than its factorization.

724145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144834.

The product of its digits is 1120, while the sum is 23.

The square root of 724145 is about 850.9670968962. The cubic root of 724145 is about 89.7997605826.

The spelling of 724145 in words is "seven hundred twenty-four thousand, one hundred forty-five".