421725 has 12 divisors (see below), whose sum is σ = 697376. Its totient is φ = 224880.

The previous prime is 421717. The next prime is 421727. The reversal of 421725 is 527124.

It is not a de Polignac number, because 421725 - 2³ = 421717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421727) 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 11 ways as a sum of consecutive naturals, for example, 2737 + ... + 2886.

2⁴²¹⁷²⁵ is an apocalyptic number.

It is an amenable number.

421725 is a deficient number, since it is larger than the sum of its proper divisors (275651).

421725 is a wasteful number, since it uses less digits than its factorization.

421725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5636 (or 5631 counting only the distinct ones).

The product of its digits is 560, while the sum is 21.

The square root of 421725 is about 649.4035725187. The cubic root of 421725 is about 74.9911100574.

Adding to 421725 its reverse (527124), we get a palindrome (948849).

The spelling of 421725 in words is "four hundred twenty-one thousand, seven hundred twenty-five".