630805 has 16 divisors (see below), whose sum is σ = 881280. Its totient is φ = 424512.

The previous prime is 630803. The next prime is 630823. The reversal of 630805 is 508036.

It is not a de Polignac number, because 630805 - 2¹ = 630803 is a prime.

630805 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (630803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2211 + ... + 2479.

It is an arithmetic number, because the mean of its divisors is an integer number (55080).

2⁶³⁰⁸⁰⁵ is an apocalyptic number.

It is an amenable number.

630805 is a deficient number, since it is larger than the sum of its proper divisors (250475).

630805 is a wasteful number, since it uses less digits than its factorization.

630805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 348.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 630805 is about 794.2323337664. The cubic root of 630805 is about 85.7626862887.

The spelling of 630805 in words is "six hundred thirty thousand, eight hundred five".