30765139 has 2 divisors, whose sum is σ = 30765140. Its totient is φ = 30765138.

The previous prime is 30765107. The next prime is 30765149. The reversal of 30765139 is 93156703.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 30765139 - 2⁵ = 30765107 is a prime.

It is not a weakly prime, because it can be changed into another prime (30765149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15382569 + 15382570.

It is an arithmetic number, because the mean of its divisors is an integer number (15382570).

Almost surely, 2^30765139 is an apocalyptic number.

30765139 is a deficient number, since it is larger than the sum of its proper divisors (1).

30765139 is an equidigital number, since it uses as much as digits as its factorization.

30765139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17010, while the sum is 34.

The square root of 30765139 is about 5546.6331228954. The cubic root of 30765139 is about 313.3427331067.

The spelling of 30765139 in words is "thirty million, seven hundred sixty-five thousand, one hundred thirty-nine".