630705 has 16 divisors (see below), whose sum is σ = 1062720. Its totient is φ = 318528.

The previous prime is 630701. The next prime is 630709. The reversal of 630705 is 507036.

It is an interprime number because it is at equal distance from previous prime (630701) and next prime (630709).

It is not a de Polignac number, because 630705 - 2² = 630701 is a prime.

It is an Ulam number.

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

It is a Curzon number.

630705 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (630701) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 822 + ... + 1391.

It is an arithmetic number, because the mean of its divisors is an integer number (66420).

2⁶³⁰⁷⁰⁵ is an apocalyptic number.

It is an amenable number.

630705 is a deficient number, since it is larger than the sum of its proper divisors (432015).

630705 is a wasteful number, since it uses less digits than its factorization.

630705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2240.

The product of its (nonzero) digits is 630, while the sum is 21.

The square root of 630705 is about 794.1693774001. The cubic root of 630705 is about 85.7581541317.

The spelling of 630705 in words is "six hundred thirty thousand, seven hundred five".