630819 has 48 divisors (see below), whose sum is σ = 1198080. Its totient is φ = 311040.

The previous prime is 630803. The next prime is 630823. The reversal of 630819 is 918036.

It is not a de Polignac number, because 630819 - 2⁴ = 630803 is a prime.

It is a super-2 number, since 2×630819² = 795865221522, which contains 22 as substring.

630819 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 630792 and 630801.

It is not an unprimeable number, because it can be changed into a prime (630899) 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 47 ways as a sum of consecutive naturals, for example, 20334 + ... + 20364.

It is an arithmetic number, because the mean of its divisors is an integer number (24960).

2⁶³⁰⁸¹⁹ is an apocalyptic number.

630819 is a deficient number, since it is larger than the sum of its proper divisors (567261).

630819 is a wasteful number, since it uses less digits than its factorization.

630819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80 (or 77 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 630819 is about 794.2411472594. The cubic root of 630819 is about 85.7633207524.

The spelling of 630819 in words is "six hundred thirty thousand, eight hundred nineteen".