30948139 has 2 divisors, whose sum is σ = 30948140. Its totient is φ = 30948138.

The previous prime is 30948107. The next prime is 30948149. The reversal of 30948139 is 93184903.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 30948139 - 2⁵ = 30948107 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 30948098 and 30948107.

It is not a weakly prime, because it can be changed into another prime (30948149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15474069 + 15474070.

It is an arithmetic number, because the mean of its divisors is an integer number (15474070).

Almost surely, 2^30948139 is an apocalyptic number.

30948139 is a deficient number, since it is larger than the sum of its proper divisors (1).

30948139 is an equidigital number, since it uses as much as digits as its factorization.

30948139 is an evil number, because the sum of its binary digits is even.

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

The square root of 30948139 is about 5563.1051580929. The cubic root of 30948139 is about 313.9627898893.

The spelling of 30948139 in words is "thirty million, nine hundred forty-eight thousand, one hundred thirty-nine".