305240520042 has 20 divisors (see below), whose sum is σ = 683964869346. Its totient is φ = 101746839960.

The previous prime is 305240520031. The next prime is 305240520047. The reversal of 305240520042 is 240025042503.

It is a happy number.

305240520042 is a `hidden beast` number, since 3 + 0 + 52 + 405 + 200 + 4 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 237255693921 + 67984826121 = 487089^2 + 260739^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 305240519988 and 305240520015.

It is not an unprimeable number, because it can be changed into a prime (305240520047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 942100209 + ... + 942100532.

Almost surely, 2^305240520042 is an apocalyptic number.

305240520042 is an abundant number, since it is smaller than the sum of its proper divisors (378724349304).

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

305240520042 is a wasteful number, since it uses less digits than its factorization.

305240520042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1884200755 (or 1884200746 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 27.

Adding to 305240520042 its reverse (240025042503), we get a palindrome (545265562545).

The spelling of 305240520042 in words is "three hundred five billion, two hundred forty million, five hundred twenty thousand, forty-two".