630440 has 16 divisors (see below), whose sum is σ = 1418580. Its totient is φ = 252160.

The previous prime is 630433. The next prime is 630451. The reversal of 630440 is 44036.

630440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 630436 + 4 = 794^2 + 2^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7841 + ... + 7920.

2⁶³⁰⁴⁴⁰ is an apocalyptic number.

It is an amenable number.

630440 is an abundant number, since it is smaller than the sum of its proper divisors (788140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

630440 is a wasteful number, since it uses less digits than its factorization.

630440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15772 (or 15768 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 630440 is about 794.0025188877. The cubic root of 630440 is about 85.7461415984.

Adding to 630440 its reverse (44036), we get a palindrome (674476).

The spelling of 630440 in words is "six hundred thirty thousand, four hundred forty".