306421 has 2 divisors, whose sum is σ = 306422. Its totient is φ = 306420.

The previous prime is 306419. The next prime is 306431. The reversal of 306421 is 124603.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 236196 + 70225 = 486^2 + 265^2 .

It is a cyclic number.

It is not a de Polignac number, because 306421 - 2¹ = 306419 is a prime.

Together with 306419, it forms a pair of twin primes.

It is an Ulam number.

306421 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 306395 and 306404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (306431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 153210 + 153211.

It is an arithmetic number, because the mean of its divisors is an integer number (153211).

2³⁰⁶⁴²¹ is an apocalyptic number.

It is an amenable number.

306421 is a deficient number, since it is larger than the sum of its proper divisors (1).

306421 is an equidigital number, since it uses as much as digits as its factorization.

306421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 306421 is about 553.5530688200. The cubic root of 306421 is about 67.4175307415.

It can be divided in two parts, 306 and 421, that added together give a palindrome (727).

The spelling of 306421 in words is "three hundred six thousand, four hundred twenty-one".