490639 has 4 divisors (see below), whose sum is σ = 493560. Its totient is φ = 487720.

The previous prime is 490631. The next prime is 490643. The reversal of 490639 is 936094.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 490639 - 2³ = 490631 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 490639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (490631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1192 + ... + 1549.

It is an arithmetic number, because the mean of its divisors is an integer number (123390).

2⁴⁹⁰⁶³⁹ is an apocalyptic number.

490639 is a deficient number, since it is larger than the sum of its proper divisors (2921).

490639 is a wasteful number, since it uses less digits than its factorization.

490639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2920.

The product of its (nonzero) digits is 5832, while the sum is 31.

The square root of 490639 is about 700.4562798633. The cubic root of 490639 is about 78.8716068589.

The spelling of 490639 in words is "four hundred ninety thousand, six hundred thirty-nine".