499690821 has 16 divisors (see below), whose sum is σ = 780006528. Its totient is φ = 278572800.

The previous prime is 499690813. The next prime is 499690901. The reversal of 499690821 is 128096994.

It is not a de Polignac number, because 499690821 - 2³ = 499690813 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (499690811) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 289320 + ... + 291041.

It is an arithmetic number, because the mean of its divisors is an integer number (48750408).

Almost surely, 2^499690821 is an apocalyptic number.

499690821 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

499690821 is a deficient number, since it is larger than the sum of its proper divisors (280315707).

499690821 is a wasteful number, since it uses less digits than its factorization.

499690821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 580412.

The product of its (nonzero) digits is 279936, while the sum is 48.

The square root of 499690821 is about 22353.7652533080. The cubic root of 499690821 is about 793.5368952287.

The spelling of 499690821 in words is "four hundred ninety-nine million, six hundred ninety thousand, eight hundred twenty-one".