630849 has 4 divisors (see below), whose sum is σ = 841136. Its totient is φ = 420564.

The previous prime is 630841. The next prime is 630863. The reversal of 630849 is 948036.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 630849 - 2³ = 630841 is a prime.

It is an Ulam number.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (630841) 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, 105139 + ... + 105144.

It is an arithmetic number, because the mean of its divisors is an integer number (210284).

2⁶³⁰⁸⁴⁹ is an apocalyptic number.

It is an amenable number.

630849 is a deficient number, since it is larger than the sum of its proper divisors (210287).

630849 is a wasteful number, since it uses less digits than its factorization.

630849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210286.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 630849 is about 794.2600329867. The cubic root of 630849 is about 85.7646802860.

The spelling of 630849 in words is "six hundred thirty thousand, eight hundred forty-nine".