306139 has 2 divisors, whose sum is σ = 306140. Its totient is φ = 306138.

The previous prime is 306133. The next prime is 306149. The reversal of 306139 is 931603.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 306139 - 2⁷ = 306011 is a prime.

It is not a weakly prime, because it can be changed into another prime (306133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 153069 + 153070.

It is an arithmetic number, because the mean of its divisors is an integer number (153070).

2³⁰⁶¹³⁹ is an apocalyptic number.

306139 is a deficient number, since it is larger than the sum of its proper divisors (1).

306139 is an equidigital number, since it uses as much as digits as its factorization.

306139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 486, while the sum is 22.

The square root of 306139 is about 553.2982920632. The cubic root of 306139 is about 67.3968428873.

The spelling of 306139 in words is "three hundred six thousand, one hundred thirty-nine".