630823 has 2 divisors, whose sum is σ = 630824. Its totient is φ = 630822.

The previous prime is 630803. The next prime is 630827. The reversal of 630823 is 328036.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-630823 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 630794 and 630803.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (630827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315411 + 315412.

It is an arithmetic number, because the mean of its divisors is an integer number (315412).

2⁶³⁰⁸²³ is an apocalyptic number.

630823 is a deficient number, since it is larger than the sum of its proper divisors (1).

630823 is an equidigital number, since it uses as much as digits as its factorization.

630823 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 630823 is about 794.2436653824. The cubic root of 630823 is about 85.7635020261.

Adding to 630823 its reverse (328036), we get a palindrome (958859).

The spelling of 630823 in words is "six hundred thirty thousand, eight hundred twenty-three".