499493821 has 4 divisors (see below), whose sum is σ = 512993692. Its totient is φ = 485993952.

The previous prime is 499493807. The next prime is 499493849. The reversal of 499493821 is 128394994.

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

It can be written as a sum of positive squares in 2 ways, for example, as 338964921 + 160528900 = 18411^2 + 12670^2 .

It is a cyclic number.

It is not a de Polignac number, because 499493821 - 2⁵ = 499493789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (499493021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6749880 + ... + 6749953.

It is an arithmetic number, because the mean of its divisors is an integer number (128248423).

Almost surely, 2^499493821 is an apocalyptic number.

It is an amenable number.

499493821 is a deficient number, since it is larger than the sum of its proper divisors (13499871).

499493821 is a wasteful number, since it uses less digits than its factorization.

499493821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13499870.

The product of its digits is 559872, while the sum is 49.

The square root of 499493821 is about 22349.3584024240. The cubic root of 499493821 is about 793.4325991921.

The spelling of 499493821 in words is "four hundred ninety-nine million, four hundred ninety-three thousand, eight hundred twenty-one".