30857947 has 2 divisors, whose sum is σ = 30857948. Its totient is φ = 30857946.

The previous prime is 30857933. The next prime is 30857951. The reversal of 30857947 is 74975803.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30857947 is a prime.

It is not a weakly prime, because it can be changed into another prime (30857977) 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, 15428973 + 15428974.

It is an arithmetic number, because the mean of its divisors is an integer number (15428974).

Almost surely, 2^30857947 is an apocalyptic number.

30857947 is a deficient number, since it is larger than the sum of its proper divisors (1).

30857947 is an equidigital number, since it uses as much as digits as its factorization.

30857947 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 211680, while the sum is 43.

The square root of 30857947 is about 5554.9929792935. The cubic root of 30857947 is about 313.6574997550.

The spelling of 30857947 in words is "thirty million, eight hundred fifty-seven thousand, nine hundred forty-seven".