308240 has 20 divisors (see below), whose sum is σ = 716844. Its totient is φ = 123264.

The previous prime is 308219. The next prime is 308249. The reversal of 308240 is 42803.

It can be written as a sum of positive squares in 2 ways, for example, as 234256 + 73984 = 484^2 + 272^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (308249) 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, 1847 + ... + 2006.

2³⁰⁸²⁴⁰ is an apocalyptic number.

It is an amenable number.

308240 is an abundant number, since it is smaller than the sum of its proper divisors (408604).

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

308240 is a wasteful number, since it uses less digits than its factorization.

308240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3866 (or 3860 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 308240 is about 555.1936599062. The cubic root of 308240 is about 67.5506706866.

It can be divided in two parts, 308 and 240, that multiplied together give a triangular number (73920 = T₃₈₄).

The spelling of 308240 in words is "three hundred eight thousand, two hundred forty".