630421 has 8 divisors (see below), whose sum is σ = 693504. Its totient is φ = 568320.

The previous prime is 630391. The next prime is 630433. The reversal of 630421 is 124036.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 630421 - 2¹¹ = 628373 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 630395 and 630404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (630451) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 2325 + ... + 2581.

It is an arithmetic number, because the mean of its divisors is an integer number (86688).

2⁶³⁰⁴²¹ is an apocalyptic number.

It is an amenable number.

630421 is a deficient number, since it is larger than the sum of its proper divisors (63083).

630421 is a wasteful number, since it uses less digits than its factorization.

630421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 491.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 630421 is about 793.9905541000. The cubic root of 630421 is about 85.7452801931.

Adding to 630421 its reverse (124036), we get a palindrome (754457).

The spelling of 630421 in words is "six hundred thirty thousand, four hundred twenty-one".