305212520 has 32 divisors (see below), whose sum is σ = 688240800. Its totient is φ = 121816128.

The previous prime is 305212483. The next prime is 305212529. The reversal of 305212520 is 25212503.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 305212492 and 305212501.

It is not an unprimeable number, because it can be changed into a prime (305212529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10511 + ... + 26849.

It is an arithmetic number, because the mean of its divisors is an integer number (21507525).

Almost surely, 2^305212520 is an apocalyptic number.

It is an amenable number.

305212520 is an abundant number, since it is smaller than the sum of its proper divisors (383028280).

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

305212520 is a wasteful number, since it uses less digits than its factorization.

305212520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16817 (or 16813 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 305212520 is about 17470.3325669548. The cubic root of 305212520 is about 673.2878565066.

The spelling of 305212520 in words is "three hundred five million, two hundred twelve thousand, five hundred twenty".