630621 has 12 divisors (see below), whose sum is σ = 933660. Its totient is φ = 409920.

The previous prime is 630613. The next prime is 630659. The reversal of 630621 is 126036.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 68121 + 562500 = 261^2 + 750^2 .

It is not a de Polignac number, because 630621 - 2³ = 630613 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 630594 and 630603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (630521) 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, 486 + ... + 1223.

It is an arithmetic number, because the mean of its divisors is an integer number (77805).

2⁶³⁰⁶²¹ is an apocalyptic number.

It is an amenable number.

630621 is a deficient number, since it is larger than the sum of its proper divisors (303039).

630621 is a wasteful number, since it uses less digits than its factorization.

630621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1756 (or 1753 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 630621 is about 794.1164901952. The cubic root of 630621 is about 85.7543467496.

Adding to 630621 its reverse (126036), we get a palindrome (756657).

The spelling of 630621 in words is "six hundred thirty thousand, six hundred twenty-one".