304040520 has 256 divisors, whose sum is σ = 1170892800. Its totient is φ = 68739840.

The previous prime is 304040497. The next prime is 304040549. The reversal of 304040520 is 25040403.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 304040493 and 304040502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 990207 + ... + 990513.

It is an arithmetic number, because the mean of its divisors is an integer number (4573800).

Almost surely, 2^304040520 is an apocalyptic number.

304040520 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 304040520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (585446400).

304040520 is an abundant number, since it is smaller than the sum of its proper divisors (866852280).

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

304040520 is a wasteful number, since it uses less digits than its factorization.

304040520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 465 (or 455 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 18.

The square root of 304040520 is about 17436.7577261370. The cubic root of 304040520 is about 672.4249544281.

Adding to 304040520 its reverse (25040403), we get a palindrome (329080923).

The spelling of 304040520 in words is "three hundred four million, forty thousand, five hundred twenty".