30138929 has 2 divisors, whose sum is σ = 30138930. Its totient is φ = 30138928.

The previous prime is 30138907. The next prime is 30138931. The reversal of 30138929 is 92983103.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15523600 + 14615329 = 3940^2 + 3823^2 .

It is a cyclic number.

It is not a de Polignac number, because 30138929 - 2¹² = 30134833 is a prime.

Together with 30138931, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (30138949) 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, 15069464 + 15069465.

It is an arithmetic number, because the mean of its divisors is an integer number (15069465).

Almost surely, 2^30138929 is an apocalyptic number.

It is an amenable number.

30138929 is a deficient number, since it is larger than the sum of its proper divisors (1).

30138929 is an equidigital number, since it uses as much as digits as its factorization.

30138929 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 30138929 is about 5489.8933505124. The cubic root of 30138929 is about 311.2021617526.

The spelling of 30138929 in words is "thirty million, one hundred thirty-eight thousand, nine hundred twenty-nine".