512405 has 4 divisors (see below), whose sum is σ = 614892. Its totient is φ = 409920.

The previous prime is 512389. The next prime is 512419. The reversal of 512405 is 504215.

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

It can be written as a sum of positive squares in 2 ways, for example, as 398161 + 114244 = 631^2 + 338^2 .

It is not a de Polignac number, because 512405 - 2⁴ = 512389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 51236 + ... + 51245.

It is an arithmetic number, because the mean of its divisors is an integer number (153723).

2⁵¹²⁴⁰⁵ is an apocalyptic number.

It is an amenable number.

512405 is a deficient number, since it is larger than the sum of its proper divisors (102487).

512405 is a wasteful number, since it uses less digits than its factorization.

512405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102486.

The product of its (nonzero) digits is 200, while the sum is 17.

The square root of 512405 is about 715.8246992106. The cubic root of 512405 is about 80.0210881906.

The spelling of 512405 in words is "five hundred twelve thousand, four hundred five".