421425 has 18 divisors (see below), whose sum is σ = 755222. Its totient is φ = 224640.

The previous prime is 421423. The next prime is 421433. The reversal of 421425 is 524124.

It can be written as a sum of positive squares in 3 ways, for example, as 1521 + 419904 = 39^2 + 648^2 .

It is not a de Polignac number, because 421425 - 2¹ = 421423 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 421398 and 421407.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 421425.

It is not an unprimeable number, because it can be changed into a prime (421423) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 712 + ... + 1161.

2⁴²¹⁴²⁵ is an apocalyptic number.

421425 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

421425 is a deficient number, since it is larger than the sum of its proper divisors (333797).

421425 is a wasteful number, since it uses less digits than its factorization.

421425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1889 (or 1881 counting only the distinct ones).

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

The square root of 421425 is about 649.1725502515. The cubic root of 421425 is about 74.9733238462.

Adding to 421425 its reverse (524124), we get a palindrome (945549).

The spelling of 421425 in words is "four hundred twenty-one thousand, four hundred twenty-five".