720493 has 4 divisors (see below), whose sum is σ = 738108. Its totient is φ = 702880.

The previous prime is 720491. The next prime is 720497. The reversal of 720493 is 394027.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 394027 = 67 ⋅5881.

It can be written as a sum of positive squares in 2 ways, for example, as 233289 + 487204 = 483^2 + 698^2 .

It is a cyclic number.

It is not a de Polignac number, because 720493 - 2¹ = 720491 is a prime.

It is a super-2 number, since 2×720493² = 1038220326098, which contains 22 as substring.

It is a Duffinian number.

720493 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720491) 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, 8746 + ... + 8827.

It is an arithmetic number, because the mean of its divisors is an integer number (184527).

2⁷²⁰⁴⁹³ is an apocalyptic number.

It is an amenable number.

720493 is a deficient number, since it is larger than the sum of its proper divisors (17615).

720493 is a wasteful number, since it uses less digits than its factorization.

720493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17614.

The product of its (nonzero) digits is 1512, while the sum is 25.

The square root of 720493 is about 848.8185907483. The cubic root of 720493 is about 89.6485470466.

The spelling of 720493 in words is "seven hundred twenty thousand, four hundred ninety-three".