308155 has 4 divisors (see below), whose sum is σ = 369792. Its totient is φ = 246520.

The previous prime is 308153. The next prime is 308213. The reversal of 308155 is 551803.

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

It is not a de Polignac number, because 308155 - 2¹ = 308153 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

308155 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (308153) 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, 30811 + ... + 30820.

It is an arithmetic number, because the mean of its divisors is an integer number (92448).

2³⁰⁸¹⁵⁵ is an apocalyptic number.

308155 is a deficient number, since it is larger than the sum of its proper divisors (61637).

308155 is an equidigital number, since it uses as much as digits as its factorization.

308155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61636.

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 308155 is about 555.1171047626. The cubic root of 308155 is about 67.5444608773.

Adding to 308155 its reverse (551803), we get a palindrome (859958).

It can be divided in two parts, 3081 and 55, that added together give a square (3136 = 56²).

The spelling of 308155 in words is "three hundred eight thousand, one hundred fifty-five".