630905 has 8 divisors (see below), whose sum is σ = 825984. Its totient is φ = 458800.

The previous prime is 630901. The next prime is 630907. The reversal of 630905 is 509036.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 630905 - 2² = 630901 is a prime.

It is a super-2 number, since 2×630905² = 796082238050, which contains 22 as substring.

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 (630901) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5681 + ... + 5790.

It is an arithmetic number, because the mean of its divisors is an integer number (103248).

2⁶³⁰⁹⁰⁵ is an apocalyptic number.

It is an amenable number.

630905 is a deficient number, since it is larger than the sum of its proper divisors (195079).

630905 is a wasteful number, since it uses less digits than its factorization.

630905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11487.

The product of its (nonzero) digits is 810, while the sum is 23.

The square root of 630905 is about 794.2952851427. The cubic root of 630905 is about 85.7672179667.

The spelling of 630905 in words is "six hundred thirty thousand, nine hundred five".