630839 has 4 divisors (see below), whose sum is σ = 688200. Its totient is φ = 573480.

The previous prime is 630827. The next prime is 630841. The reversal of 630839 is 938036.

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

It is a cyclic number.

It is not a de Polignac number, because 630839 - 2⁴ = 630823 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (630899) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28664 + ... + 28685.

It is an arithmetic number, because the mean of its divisors is an integer number (172050).

2⁶³⁰⁸³⁹ is an apocalyptic number.

630839 is a deficient number, since it is larger than the sum of its proper divisors (57361).

630839 is a wasteful number, since it uses less digits than its factorization.

630839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57360.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 630839 is about 794.2537377942. The cubic root of 630839 is about 85.7642271129.

The spelling of 630839 in words is "six hundred thirty thousand, eight hundred thirty-nine".