425421 has 6 divisors (see below), whose sum is σ = 614510. Its totient is φ = 283608.

The previous prime is 425419. The next prime is 425423. The reversal of 425421 is 124524.

It is an interprime number because it is at equal distance from previous prime (425419) and next prime (425423).

It can be written as a sum of positive squares in only one way, i.e., 236196 + 189225 = 486^2 + 435^2 .

It is not a de Polignac number, because 425421 - 2¹ = 425419 is a prime.

It is a Duffinian number.

425421 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 425394 and 425403.

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 425421.

It is not an unprimeable number, because it can be changed into a prime (425423) 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 5 ways as a sum of consecutive naturals, for example, 23626 + ... + 23643.

2⁴²⁵⁴²¹ is an apocalyptic number.

It is an amenable number.

425421 is a deficient number, since it is larger than the sum of its proper divisors (189089).

425421 is a wasteful number, since it uses less digits than its factorization.

425421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47275 (or 47272 counting only the distinct ones).

The product of its digits is 320, while the sum is 18.

The square root of 425421 is about 652.2430528568. The cubic root of 425421 is about 75.2095473203.

Adding to 425421 its reverse (124524), we get a palindrome (549945).

It can be divided in two parts, 4 and 25421, that added together give a triangular number (25425 = T₂₂₅).

The spelling of 425421 in words is "four hundred twenty-five thousand, four hundred twenty-one".