490840 has 32 divisors (see below), whose sum is σ = 1262880. Its totient is φ = 168192.

The previous prime is 490837. The next prime is 490849. The reversal of 490840 is 48094.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (490849) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 597 + ... + 1156.

It is an arithmetic number, because the mean of its divisors is an integer number (39465).

2⁴⁹⁰⁸⁴⁰ is an apocalyptic number.

490840 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

490840 is an abundant number, since it is smaller than the sum of its proper divisors (772040).

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

490840 is a wasteful number, since it uses less digits than its factorization.

490840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1771 (or 1767 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 490840 is about 700.5997430773. The cubic root of 490840 is about 78.8823758280.

The spelling of 490840 in words is "four hundred ninety thousand, eight hundred forty".