490938209 has 4 divisors (see below), whose sum is σ = 492220416. Its totient is φ = 489656004.

The previous prime is 490938199. The next prime is 490938211. The reversal of 490938209 is 902839094.

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 a cyclic number.

It is not a de Polignac number, because 490938209 - 2²⁰ = 489889633 is a prime.

It is a super-2 number, since 2×490938209² = 482040650112255362, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 490938209.

It is not an unprimeable number, because it can be changed into a prime (490938229) 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, 640529 + ... + 641294.

It is an arithmetic number, because the mean of its divisors is an integer number (123055104).

Almost surely, 2^490938209 is an apocalyptic number.

It is an amenable number.

490938209 is a deficient number, since it is larger than the sum of its proper divisors (1282207).

490938209 is a wasteful number, since it uses less digits than its factorization.

490938209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1282206.

The product of its (nonzero) digits is 139968, while the sum is 44.

The square root of 490938209 is about 22157.1254678941. The cubic root of 490938209 is about 788.8763649852.

The spelling of 490938209 in words is "four hundred ninety million, nine hundred thirty-eight thousand, two hundred nine".