308440 has 32 divisors (see below), whose sum is σ = 758160. Its totient is φ = 112000.

The previous prime is 308437. The next prime is 308447. The reversal of 308440 is 44803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (308447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 90 + ... + 790.

2³⁰⁸⁴⁴⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 308440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (379080).

308440 is an abundant number, since it is smaller than the sum of its proper divisors (449720).

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

308440 is a wasteful number, since it uses less digits than its factorization.

308440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 723 (or 719 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 308440 is about 555.3737480292. The cubic root of 308440 is about 67.5652775008.

The spelling of 308440 in words is "three hundred eight thousand, four hundred forty".