30138949 has 2 divisors, whose sum is σ = 30138950. Its totient is φ = 30138948.

The previous prime is 30138931. The next prime is 30138961. The reversal of 30138949 is 94983103.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29757025 + 381924 = 5455^2 + 618^2 .

It is a cyclic number.

It is not a de Polignac number, because 30138949 - 2¹¹ = 30136901 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30138929) 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, 15069474 + 15069475.

It is an arithmetic number, because the mean of its divisors is an integer number (15069475).

Almost surely, 2^30138949 is an apocalyptic number.

It is an amenable number.

30138949 is a deficient number, since it is larger than the sum of its proper divisors (1).

30138949 is an equidigital number, since it uses as much as digits as its factorization.

30138949 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 30138949 is about 5489.8951720411. The cubic root of 30138949 is about 311.2022305898.

The spelling of 30138949 in words is "thirty million, one hundred thirty-eight thousand, nine hundred forty-nine".