308863 has 4 divisors (see below), whose sum is σ = 313168. Its totient is φ = 304560.

The previous prime is 308857. The next prime is 308887. The reversal of 308863 is 368803.

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 308863 - 2¹⁷ = 177791 is a prime.

It is a Duffinian number.

308863 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (308813) 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 in 3 ways as a sum of consecutive naturals, for example, 2043 + ... + 2188.

It is an arithmetic number, because the mean of its divisors is an integer number (78292).

2³⁰⁸⁸⁶³ is an apocalyptic number.

308863 is a deficient number, since it is larger than the sum of its proper divisors (4305).

308863 is an equidigital number, since it uses as much as digits as its factorization.

308863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4304.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 308863 is about 555.7544421775. The cubic root of 308863 is about 67.5961501256.

The spelling of 308863 in words is "three hundred eight thousand, eight hundred sixty-three".