305676421 has 2 divisors, whose sum is σ = 305676422. Its totient is φ = 305676420.

The previous prime is 305676419. The next prime is 305676451. The reversal of 305676421 is 124676503.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 256480225 + 49196196 = 16015^2 + 7014^2 .

It is a cyclic number.

It is not a de Polignac number, because 305676421 - 2¹ = 305676419 is a prime.

Together with 305676419, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (305676401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 152838210 + 152838211.

It is an arithmetic number, because the mean of its divisors is an integer number (152838211).

Almost surely, 2^305676421 is an apocalyptic number.

It is an amenable number.

305676421 is a deficient number, since it is larger than the sum of its proper divisors (1).

305676421 is an equidigital number, since it uses as much as digits as its factorization.

305676421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30240, while the sum is 34.

The square root of 305676421 is about 17483.6043480742. The cubic root of 305676421 is about 673.6288001429.

The spelling of 305676421 in words is "three hundred five million, six hundred seventy-six thousand, four hundred twenty-one".