499840 has 64 divisors (see below), whose sum is σ = 1321920. Its totient is φ = 179200.

The previous prime is 499819. The next prime is 499853. The reversal of 499840 is 48994.

499840 = 67² + 68² + ... + 121².

It is a tau number, because it is divible by the number of its divisors (64).

It is a junction number, because it is equal to n+sod(n) for n = 499796 and 499805.

It is an unprimeable number.

499840 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7005 + ... + 7075.

It is an arithmetic number, because the mean of its divisors is an integer number (20655).

2⁴⁹⁹⁸⁴⁰ is an apocalyptic number.

499840 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 499840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (660960).

499840 is an abundant number, since it is smaller than the sum of its proper divisors (822080).

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

499840 is a wasteful number, since it uses less digits than its factorization.

499840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101 (or 89 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 499840 is about 706.9936350491. The cubic root of 499840 is about 79.3615855563.

It can be divided in two parts, 49 and 9840, that added together give a palindrome (9889).

The spelling of 499840 in words is "four hundred ninety-nine thousand, eight hundred forty".