306139397 has 2 divisors, whose sum is σ = 306139398. Its totient is φ = 306139396.

The previous prime is 306139391. The next prime is 306139409. The reversal of 306139397 is 793931603.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 281199361 + 24940036 = 16769^2 + 4994^2 .

It is a cyclic number.

It is not a de Polignac number, because 306139397 - 2²⁴ = 289362181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (306139391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 153069698 + 153069699.

It is an arithmetic number, because the mean of its divisors is an integer number (153069699).

Almost surely, 2^306139397 is an apocalyptic number.

It is an amenable number.

306139397 is a deficient number, since it is larger than the sum of its proper divisors (1).

306139397 is an equidigital number, since it uses as much as digits as its factorization.

306139397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 91854, while the sum is 41.

The square root of 306139397 is about 17496.8396289158. The cubic root of 306139397 is about 673.9687202066.

The spelling of 306139397 in words is "three hundred six million, one hundred thirty-nine thousand, three hundred ninety-seven".