425605 has 4 divisors (see below), whose sum is σ = 510732. Its totient is φ = 340480.

The previous prime is 425603. The next prime is 425609. The reversal of 425605 is 506524.

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 289444 + 136161 = 538^2 + 369^2 .

It is not a de Polignac number, because 425605 - 2¹ = 425603 is a prime.

It is a super-2 number, since 2×425605² = 362279232050, which contains 22 as substring.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (425603) 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, 42556 + ... + 42565.

It is an arithmetic number, because the mean of its divisors is an integer number (127683).

2⁴²⁵⁶⁰⁵ is an apocalyptic number.

It is an amenable number.

425605 is a deficient number, since it is larger than the sum of its proper divisors (85127).

425605 is an equidigital number, since it uses as much as digits as its factorization.

425605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85126.

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 425605 is about 652.3840893216. The cubic root of 425605 is about 75.2203887865.

The spelling of 425605 in words is "four hundred twenty-five thousand, six hundred five".