505430421 has 4 divisors (see below), whose sum is σ = 673907232. Its totient is φ = 336953612.

The previous prime is 505430407. The next prime is 505430437. The reversal of 505430421 is 124034505.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 505430421 - 2⁵ = 505430389 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 505430391 and 505430400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505430461) 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 3 ways as a sum of consecutive naturals, for example, 84238401 + ... + 84238406.

It is an arithmetic number, because the mean of its divisors is an integer number (168476808).

Almost surely, 2^505430421 is an apocalyptic number.

It is an amenable number.

505430421 is a deficient number, since it is larger than the sum of its proper divisors (168476811).

505430421 is a wasteful number, since it uses less digits than its factorization.

505430421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168476810.

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 505430421 is about 22481.7797560602. The cubic root of 505430421 is about 796.5636043876.

Adding to 505430421 its reverse (124034505), we get a palindrome (629464926).

The spelling of 505430421 in words is "five hundred five million, four hundred thirty thousand, four hundred twenty-one".