512405421 has 32 divisors (see below), whose sum is σ = 768946176. Its totient is φ = 300840000.

The previous prime is 512405407. The next prime is 512405423. The reversal of 512405421 is 124504215.

It is not a de Polignac number, because 512405421 - 2²⁵ = 478850989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 512405391 and 512405400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (512405423) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 155016 + ... + 158286.

It is an arithmetic number, because the mean of its divisors is an integer number (24029568).

Almost surely, 2^512405421 is an apocalyptic number.

It is an amenable number.

512405421 is a deficient number, since it is larger than the sum of its proper divisors (256540755).

512405421 is a wasteful number, since it uses less digits than its factorization.

512405421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3433.

The product of its (nonzero) digits is 1600, while the sum is 24.

The square root of 512405421 is about 22636.3738483000. The cubic root of 512405421 is about 800.2111010614.

Adding to 512405421 its reverse (124504215), we get a palindrome (636909636).

The spelling of 512405421 in words is "five hundred twelve million, four hundred five thousand, four hundred twenty-one".