730421 has 2 divisors, whose sum is σ = 730422. Its totient is φ = 730420.

The previous prime is 730399. The next prime is 730447. The reversal of 730421 is 124037.

It is a happy number.

730421 is nontrivially palindromic in base 5.

730421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 722500 + 7921 = 850^2 + 89^2 .

It is a cyclic number.

It is not a de Polignac number, because 730421 - 2¹⁴ = 714037 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 730421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (730451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 365210 + 365211.

It is an arithmetic number, because the mean of its divisors is an integer number (365211).

2⁷³⁰⁴²¹ is an apocalyptic number.

It is an amenable number.

730421 is a deficient number, since it is larger than the sum of its proper divisors (1).

730421 is an equidigital number, since it uses as much as digits as its factorization.

730421 is an evil number, because the sum of its binary digits is even.

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

The square root of 730421 is about 854.6467106355. The cubic root of 730421 is about 90.0584394118.

Adding to 730421 its reverse (124037), we get a palindrome (854458).

The spelling of 730421 in words is "seven hundred thirty thousand, four hundred twenty-one".