505405042 has 4 divisors (see below), whose sum is σ = 758107566. Its totient is φ = 252702520.

The previous prime is 505405037. The next prime is 505405049. The reversal of 505405042 is 240504505.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 504855961 + 549081 = 22469^2 + 741^2 .

It is a junction number, because it is equal to n+sod(n) for n = 505404998 and 505405016.

It is not an unprimeable number, because it can be changed into a prime (505405049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126351259 + ... + 126351262.

Almost surely, 2^505405042 is an apocalyptic number.

505405042 is a deficient number, since it is larger than the sum of its proper divisors (252702524).

505405042 is a wasteful number, since it uses less digits than its factorization.

505405042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252702523.

The product of its (nonzero) digits is 4000, while the sum is 25.

The square root of 505405042 is about 22481.2153141239. The cubic root of 505405042 is about 796.5502716417.

Adding to 505405042 its reverse (240504505), we get a palindrome (745909547).

The spelling of 505405042 in words is "five hundred five million, four hundred five thousand, forty-two".