308139 has 8 divisors (see below), whose sum is σ = 442512. Its totient is φ = 189600.

The previous prime is 308137. The next prime is 308141. The reversal of 308139 is 931803.

It is an interprime number because it is at equal distance from previous prime (308137) and next prime (308141).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 308139 - 2¹ = 308137 is a prime.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 308139.

It is not an unprimeable number, because it can be changed into a prime (308137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3912 + ... + 3989.

It is an arithmetic number, because the mean of its divisors is an integer number (55314).

2³⁰⁸¹³⁹ is an apocalyptic number.

308139 is a gapful number since it is divisible by the number (39) formed by its first and last digit.

308139 is a deficient number, since it is larger than the sum of its proper divisors (134373).

308139 is a wasteful number, since it uses less digits than its factorization.

308139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7917.

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 308139 is about 555.1026932019. The cubic root of 308139 is about 67.5432918443.

The spelling of 308139 in words is "three hundred eight thousand, one hundred thirty-nine".