421825 has 12 divisors (see below), whose sum is σ = 535680. Its totient is φ = 329360.

The previous prime is 421807. The next prime is 421831. The reversal of 421825 is 528124.

It is not a de Polignac number, because 421825 - 2⁷ = 421697 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 421796 and 421805.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 996 + ... + 1354.

It is an arithmetic number, because the mean of its divisors is an integer number (44640).

2⁴²¹⁸²⁵ is an apocalyptic number.

It is an amenable number.

421825 is a deficient number, since it is larger than the sum of its proper divisors (113855).

421825 is a wasteful number, since it uses less digits than its factorization.

421825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416 (or 411 counting only the distinct ones).

The product of its digits is 640, while the sum is 22.

The square root of 421825 is about 649.4805616799. The cubic root of 421825 is about 74.9970369200.

Adding to 421825 its reverse (528124), we get a palindrome (949949).

The spelling of 421825 in words is "four hundred twenty-one thousand, eight hundred twenty-five".