499821 has 8 divisors (see below), whose sum is σ = 761664. Its totient is φ = 285600.

The previous prime is 499819. The next prime is 499853. The reversal of 499821 is 128994.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 499821 - 2¹ = 499819 is a prime.

It is a plaindrome in base 13.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 499821.

It is not an unprimeable number, because it can be changed into a prime (499801) 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, 11880 + ... + 11921.

It is an arithmetic number, because the mean of its divisors is an integer number (95208).

2⁴⁹⁹⁸²¹ is an apocalyptic number.

It is an amenable number.

499821 is a deficient number, since it is larger than the sum of its proper divisors (261843).

499821 is a wasteful number, since it uses less digits than its factorization.

499821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23811.

The product of its digits is 5184, while the sum is 33.

The square root of 499821 is about 706.9801977425. The cubic root of 499821 is about 79.3605799750.

It can be divided in two parts, 49 and 9821, that added together give a triangular number (9870 = T₁₄₀).

The spelling of 499821 in words is "four hundred ninety-nine thousand, eight hundred twenty-one".