428405 has 8 divisors (see below), whose sum is σ = 525312. Its totient is φ = 335248.

The previous prime is 428401. The next prime is 428411. The reversal of 428405 is 504824.

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 428405 - 2² = 428401 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 428405.

It is not an unprimeable number, because it can be changed into a prime (428401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 677 + ... + 1146.

It is an arithmetic number, because the mean of its divisors is an integer number (65664).

2⁴²⁸⁴⁰⁵ is an apocalyptic number.

It is an amenable number.

428405 is a deficient number, since it is larger than the sum of its proper divisors (96907).

428405 is a wasteful number, since it uses less digits than its factorization.

428405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1875.

The product of its (nonzero) digits is 1280, while the sum is 23.

The square root of 428405 is about 654.5265464441. The cubic root of 428405 is about 75.3849834186.

The spelling of 428405 in words is "four hundred twenty-eight thousand, four hundred five".