630309 has 12 divisors (see below), whose sum is σ = 893984. Its totient is φ = 394944.

The previous prime is 630307. The next prime is 630319. The reversal of 630309 is 903036.

630309 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 630309 - 2¹ = 630307 is a prime.

It is an Ulam number.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (630307) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 504 + ... + 1230.

2⁶³⁰³⁰⁹ is an apocalyptic number.

It is an amenable number.

630309 is a deficient number, since it is larger than the sum of its proper divisors (263675).

630309 is a wasteful number, since it uses less digits than its factorization.

630309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 764 (or 747 counting only the distinct ones).

The product of its (nonzero) digits is 486, while the sum is 21.

The square root of 630309 is about 793.9200211608. The cubic root of 630309 is about 85.7402020838.

It can be divided in two parts, 630 and 309, that added together give a palindrome (939).

The spelling of 630309 in words is "six hundred thirty thousand, three hundred nine".