630866 has 16 divisors (see below), whose sum is σ = 999000. Its totient is φ = 298368.

The previous prime is 630863. The next prime is 630871. The reversal of 630866 is 668036.

It can be written as a sum of positive squares in 4 ways, for example, as 450241 + 180625 = 671^2 + 425^2 .

It is a Harshad number since it is a multiple of its sum of digits (29).

It is not an unprimeable number, because it can be changed into a prime (630863) 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 7 ways as a sum of consecutive naturals, for example, 4160 + ... + 4308.

2⁶³⁰⁸⁶⁶ is an apocalyptic number.

630866 is a deficient number, since it is larger than the sum of its proper divisors (368134).

630866 is a wasteful number, since it uses less digits than its factorization.

630866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 630866 is about 794.2707346994. The cubic root of 630866 is about 85.7654506692.

It can be divided in two parts, 6308 and 66, that multiplied together give a triangular number (416328 = T₉₁₂).

The spelling of 630866 in words is "six hundred thirty thousand, eight hundred sixty-six".