630865 has 4 divisors (see below), whose sum is σ = 757044. Its totient is φ = 504688.

The previous prime is 630863. The next prime is 630871. The reversal of 630865 is 568036.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 173889 + 456976 = 417^2 + 676^2 .

It is a cyclic number.

It is not a de Polignac number, because 630865 - 2¹ = 630863 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (630863) 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 3 ways as a sum of consecutive naturals, for example, 63082 + ... + 63091.

It is an arithmetic number, because the mean of its divisors is an integer number (189261).

2⁶³⁰⁸⁶⁵ is an apocalyptic number.

It is an amenable number.

630865 is a deficient number, since it is larger than the sum of its proper divisors (126179).

630865 is a wasteful number, since it uses less digits than its factorization.

630865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126178.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 630865 is about 794.2701051909. The cubic root of 630865 is about 85.7654053530.

The spelling of 630865 in words is "six hundred thirty thousand, eight hundred sixty-five".