30690139 has 2 divisors, whose sum is σ = 30690140. Its totient is φ = 30690138.

The previous prime is 30690109. The next prime is 30690167. The reversal of 30690139 is 93109603.

It is a strong prime.

It is an emirp because it is prime and its reverse (93109603) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30690139 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 30690139.

It is not a weakly prime, because it can be changed into another prime (30690109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15345069 + 15345070.

It is an arithmetic number, because the mean of its divisors is an integer number (15345070).

Almost surely, 2^30690139 is an apocalyptic number.

30690139 is a deficient number, since it is larger than the sum of its proper divisors (1).

30690139 is an equidigital number, since it uses as much as digits as its factorization.

30690139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4374, while the sum is 31.

The square root of 30690139 is about 5539.8681392250. The cubic root of 30690139 is about 313.0879010845.

The spelling of 30690139 in words is "thirty million, six hundred ninety thousand, one hundred thirty-nine".