724609 has 2 divisors, whose sum is σ = 724610. Its totient is φ = 724608.

The previous prime is 724601. The next prime is 724621. The reversal of 724609 is 906427.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 494209 + 230400 = 703^2 + 480^2 .

It is an emirp because it is prime and its reverse (906427) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 724609 - 2³ = 724601 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (724601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 362304 + 362305.

It is an arithmetic number, because the mean of its divisors is an integer number (362305).

2⁷²⁴⁶⁰⁹ is an apocalyptic number.

It is an amenable number.

724609 is a deficient number, since it is larger than the sum of its proper divisors (1).

724609 is an equidigital number, since it uses as much as digits as its factorization.

724609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 724609 is about 851.2396842253. The cubic root of 724609 is about 89.8189363888.

The spelling of 724609 in words is "seven hundred twenty-four thousand, six hundred nine".