30870139 has 2 divisors, whose sum is σ = 30870140. Its totient is φ = 30870138.

The previous prime is 30870137. The next prime is 30870179. The reversal of 30870139 is 93107803.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 30870139 - 2¹ = 30870137 is a prime.

Together with 30870137, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 30870139.

It is not a weakly prime, because it can be changed into another prime (30870137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15435069 + 15435070.

It is an arithmetic number, because the mean of its divisors is an integer number (15435070).

Almost surely, 2^30870139 is an apocalyptic number.

30870139 is a deficient number, since it is larger than the sum of its proper divisors (1).

30870139 is an equidigital number, since it uses as much as digits as its factorization.

30870139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 30870139 is about 5556.0902620458. The cubic root of 30870139 is about 313.6988030937.

The spelling of 30870139 in words is "thirty million, eight hundred seventy thousand, one hundred thirty-nine".