421625 has 8 divisors (see below), whose sum is σ = 526344. Its totient is φ = 337200.

The previous prime is 421621. The next prime is 421633. The reversal of 421625 is 526124.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 6889 + 414736 = 83^2 + 644^2 .

It is not a de Polignac number, because 421625 - 2² = 421621 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 421597 and 421606.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 421625.

It is not an unprimeable number, because it can be changed into a prime (421621) 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 7 ways as a sum of consecutive naturals, for example, 1562 + ... + 1811.

It is an arithmetic number, because the mean of its divisors is an integer number (65793).

2⁴²¹⁶²⁵ is an apocalyptic number.

It is an amenable number.

421625 is a deficient number, since it is larger than the sum of its proper divisors (104719).

421625 is an equidigital number, since it uses as much as digits as its factorization.

421625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3388 (or 3378 counting only the distinct ones).

The product of its digits is 480, while the sum is 20.

The square root of 421625 is about 649.3265742290. The cubic root of 421625 is about 74.9851822578.

Adding to 421625 its reverse (526124), we get a palindrome (947749).

The spelling of 421625 in words is "four hundred twenty-one thousand, six hundred twenty-five".