705421 has 2 divisors, whose sum is σ = 705422. Its totient is φ = 705420.

The previous prime is 705409. The next prime is 705427. The reversal of 705421 is 124507.

705421 is nontrivially palindromic in base 3.

705421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 469225 + 236196 = 685^2 + 486^2 .

It is a cyclic number.

It is not a de Polignac number, because 705421 - 2⁵ = 705389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (705427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 352710 + 352711.

It is an arithmetic number, because the mean of its divisors is an integer number (352711).

2⁷⁰⁵⁴²¹ is an apocalyptic number.

It is an amenable number.

705421 is a deficient number, since it is larger than the sum of its proper divisors (1).

705421 is an equidigital number, since it uses as much as digits as its factorization.

705421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 280, while the sum is 19.

The square root of 705421 is about 839.8934456227. The cubic root of 705421 is about 89.0190171036.

Adding to 705421 its reverse (124507), we get a palindrome (829928).

The spelling of 705421 in words is "seven hundred five thousand, four hundred twenty-one".