511405 has 8 divisors (see below), whose sum is σ = 640512. Its totient is φ = 391248.

The previous prime is 511391. The next prime is 511409. The reversal of 511405 is 504115.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 511405 - 2¹³ = 503213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (511409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2109 + ... + 2338.

It is an arithmetic number, because the mean of its divisors is an integer number (80064).

2⁵¹¹⁴⁰⁵ is an apocalyptic number.

It is an amenable number.

511405 is a deficient number, since it is larger than the sum of its proper divisors (129107).

511405 is a wasteful number, since it uses less digits than its factorization.

511405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4475.

The product of its (nonzero) digits is 100, while the sum is 16.

The square root of 511405 is about 715.1258630479. The cubic root of 511405 is about 79.9689984045.

The spelling of 511405 in words is "five hundred eleven thousand, four hundred five".