30768421 has 2 divisors, whose sum is σ = 30768422. Its totient is φ = 30768420.

The previous prime is 30768407. The next prime is 30768433. The reversal of 30768421 is 12486703.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30360100 + 408321 = 5510^2 + 639^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30768421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30768401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15384210 + 15384211.

It is an arithmetic number, because the mean of its divisors is an integer number (15384211).

Almost surely, 2^30768421 is an apocalyptic number.

It is an amenable number.

30768421 is a deficient number, since it is larger than the sum of its proper divisors (1).

30768421 is an equidigital number, since it uses as much as digits as its factorization.

30768421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 30768421 is about 5546.9289701600. The cubic root of 30768421 is about 313.3538750931.

The spelling of 30768421 in words is "thirty million, seven hundred sixty-eight thousand, four hundred twenty-one".