308239 has 4 divisors (see below), whose sum is σ = 309760. Its totient is φ = 306720.

The previous prime is 308219. The next prime is 308249. The reversal of 308239 is 932803.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 308239 - 2¹¹ = 306191 is a prime.

It is a super-2 number, since 2×308239² = 190022562242, which contains 22 as substring.

It is a d-powerful number, because it can be written as 3 + 0 + 2¹⁷ + 8 + 3¹¹ + 9 .

It is a Duffinian number.

308239 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (308219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 399 + ... + 880.

It is an arithmetic number, because the mean of its divisors is an integer number (77440).

2³⁰⁸²³⁹ is an apocalyptic number.

308239 is a deficient number, since it is larger than the sum of its proper divisors (1521).

308239 is a wasteful number, since it uses less digits than its factorization.

308239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1520.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 308239 is about 555.1927593188. The cubic root of 308239 is about 67.5505976367.

The spelling of 308239 in words is "three hundred eight thousand, two hundred thirty-nine".