308 has 12 divisors (see below), whose sum is σ = 672. Its totient is φ = 120.

The previous prime is 307. The next prime is 311. The reversal of 308 is 803.

308 = T_{7} + T_{8} + ... +
T_{12}.

308 is nontrivially palindromic in base 8.

308 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

308 is an esthetic number in base 6, because in such base its adjacent digits differ by 1.

308 is an admirable number.

It is a hoax number, since the sum of its digits (11) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (11).

308 is an undulating number in base 8.

It is a plaindrome in base 15 and base 16.

It is a nialpdrome in base 7.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (307) 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, 23 + ... + 33.

It is an arithmetic number, because the mean of its divisors is an integer number (56).

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 308, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (336).

308 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

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

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

The sum of its prime factors is 22 (or 20 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 308 is about 17.5499287748. The cubic root of 308 is about 6.7533134167.

308 divided by its sum of digits (11) gives a triangular number (28 = T_{7}).

Adding to 308 its reverse (803), we get a palindrome (1111).

The spelling of 308 in words is "three hundred eight", and thus it is an aban number and an oban number.

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