308040 has 64 divisors (see below), whose sum is σ = 984960. Its totient is φ = 76800.

The previous prime is 308027. The next prime is 308041. The reversal of 308040 is 40803.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (308041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1965 + ... + 2115.

It is an arithmetic number, because the mean of its divisors is an integer number (15390).

2³⁰⁸⁰⁴⁰ is an apocalyptic number.

308040 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 308040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (492480).

308040 is an abundant number, since it is smaller than the sum of its proper divisors (676920).

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

308040 is a wasteful number, since it uses less digits than its factorization.

308040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182 (or 178 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 308040 is about 555.0135133490. The cubic root of 308040 is about 67.5360575527.

Subtracting from 308040 its sum of digits (15), we obtain a square (308025 = 555²).

Adding to 308040 its reverse (40803), we get a palindrome (348843).

The spelling of 308040 in words is "three hundred eight thousand, forty".