730209 has 4 divisors (see below), whose sum is σ = 973616. Its totient is φ = 486804.

The previous prime is 730199. The next prime is 730217. The reversal of 730209 is 902037.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 730209 - 2¹⁵ = 697441 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (730909) 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, 121699 + ... + 121704.

It is an arithmetic number, because the mean of its divisors is an integer number (243404).

2⁷³⁰²⁰⁹ is an apocalyptic number.

It is an amenable number.

730209 is a deficient number, since it is larger than the sum of its proper divisors (243407).

730209 is a wasteful number, since it uses less digits than its factorization.

730209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243406.

The product of its (nonzero) digits is 378, while the sum is 21.

The square root of 730209 is about 854.5226737776. The cubic root of 730209 is about 90.0497256076.

It can be divided in two parts, 730 and 209, that added together give a palindrome (939).

The spelling of 730209 in words is "seven hundred thirty thousand, two hundred nine".