30657139 has 2 divisors, whose sum is σ = 30657140. Its totient is φ = 30657138.

The previous prime is 30657131. The next prime is 30657163. The reversal of 30657139 is 93175603.

It is a weak prime.

It is an emirp because it is prime and its reverse (93175603) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 30657139 - 2³ = 30657131 is a prime.

It is not a weakly prime, because it can be changed into another prime (30657131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15328569 + 15328570.

It is an arithmetic number, because the mean of its divisors is an integer number (15328570).

Almost surely, 2^30657139 is an apocalyptic number.

30657139 is a deficient number, since it is larger than the sum of its proper divisors (1).

30657139 is an equidigital number, since it uses as much as digits as its factorization.

30657139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17010, while the sum is 34.

The square root of 30657139 is about 5536.8889279089. Note that the first 3 decimals coincide. The cubic root of 30657139 is about 312.9756434619.

The spelling of 30657139 in words is "thirty million, six hundred fifty-seven thousand, one hundred thirty-nine".