308805 has 32 divisors (see below), whose sum is σ = 601344. Its totient is φ = 132096.

The previous prime is 308801. The next prime is 308809. The reversal of 308805 is 508803.

308805 = 8² + 9² + ... + 97².

It is an interprime number because it is at equal distance from previous prime (308801) and next prime (308809).

It is not a de Polignac number, because 308805 - 2² = 308801 is a prime.

308805 is a lucky number.

It is a nialpdrome in base 13.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 308805.

It is not an unprimeable number, because it can be changed into a prime (308801) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1699 + ... + 1871.

It is an arithmetic number, because the mean of its divisors is an integer number (18792).

2³⁰⁸⁸⁰⁵ is an apocalyptic number.

308805 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

308805 is a deficient number, since it is larger than the sum of its proper divisors (292539).

308805 is a wasteful number, since it uses less digits than its factorization.

308805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205.

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 308805 is about 555.7022584082. The cubic root of 308805 is about 67.5919186679.

The spelling of 308805 in words is "three hundred eight thousand, eight hundred five".