30205139 has 2 divisors, whose sum is σ = 30205140. Its totient is φ = 30205138.

The previous prime is 30205103. The next prime is 30205157. The reversal of 30205139 is 93150203.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 30205139 - 2²⁰ = 29156563 is a prime.

It is not a weakly prime, because it can be changed into another prime (30205199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15102569 + 15102570.

It is an arithmetic number, because the mean of its divisors is an integer number (15102570).

Almost surely, 2^30205139 is an apocalyptic number.

30205139 is a deficient number, since it is larger than the sum of its proper divisors (1).

30205139 is an equidigital number, since it uses as much as digits as its factorization.

30205139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 810, while the sum is 23.

The square root of 30205139 is about 5495.9202141225. The cubic root of 30205139 is about 311.4298808066.

The spelling of 30205139 in words is "thirty million, two hundred five thousand, one hundred thirty-nine".