30128447 has 2 divisors, whose sum is σ = 30128448. Its totient is φ = 30128446.

The previous prime is 30128443. The next prime is 30128453. The reversal of 30128447 is 74482103.

It is a weak prime.

It is an emirp because it is prime and its reverse (74482103) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 30128447 - 2² = 30128443 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30128443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15064223 + 15064224.

It is an arithmetic number, because the mean of its divisors is an integer number (15064224).

Almost surely, 2^30128447 is an apocalyptic number.

30128447 is a deficient number, since it is larger than the sum of its proper divisors (1).

30128447 is an equidigital number, since it uses as much as digits as its factorization.

30128447 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 30128447 is about 5488.9386041383. The cubic root of 30128447 is about 311.1660799650.

The spelling of 30128447 in words is "thirty million, one hundred twenty-eight thousand, four hundred forty-seven".