30385819 has 2 divisors, whose sum is σ = 30385820. Its totient is φ = 30385818.

The previous prime is 30385811. The next prime is 30385841. The reversal of 30385819 is 91858303.

It is a weak prime.

It is an emirp because it is prime and its reverse (91858303) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 30385819 - 2³ = 30385811 is a prime.

It is a super-2 number, since 2×30385819² = 1846595992601522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (30385811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15192909 + 15192910.

It is an arithmetic number, because the mean of its divisors is an integer number (15192910).

Almost surely, 2^30385819 is an apocalyptic number.

30385819 is a deficient number, since it is larger than the sum of its proper divisors (1).

30385819 is an equidigital number, since it uses as much as digits as its factorization.

30385819 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 30385819 is about 5512.3333534902. Note that the first 4 decimals coincide. The cubic root of 30385819 is about 312.0496133846.

The spelling of 30385819 in words is "thirty million, three hundred eighty-five thousand, eight hundred nineteen".