630909 has 10 divisors (see below), whose sum is σ = 942590. Its totient is φ = 420552.

The previous prime is 630907. The next prime is 630911. The reversal of 630909 is 909036.

630909 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (630907) and next prime (630911).

It can be written as a sum of positive squares in only one way, i.e., 558009 + 72900 = 747^2 + 270^2 .

It is not a de Polignac number, because 630909 - 2¹ = 630907 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

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

It is a Duffinian number.

630909 is a modest number, since divided by 909 gives 63 as remainder.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (630901) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 3814 + ... + 3975.

It is an arithmetic number, because the mean of its divisors is an integer number (94259).

2⁶³⁰⁹⁰⁹ is an apocalyptic number.

It is an amenable number.

630909 is a deficient number, since it is larger than the sum of its proper divisors (311681).

630909 is an equidigital number, since it uses as much as digits as its factorization.

630909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7801 (or 7792 counting only the distinct ones).

The product of its (nonzero) digits is 1458, while the sum is 27.

The square root of 630909 is about 794.2978030940. The cubic root of 630909 is about 85.7673992239.

The spelling of 630909 in words is "six hundred thirty thousand, nine hundred nine".