498978821 has 16 divisors (see below), whose sum is σ = 562933248. Its totient is φ = 438177600.

The previous prime is 498978803. The next prime is 498978827. The reversal of 498978821 is 128879894.

It is a cyclic number.

It is not a de Polignac number, because 498978821 - 2⁶ = 498978757 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (498978827) 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, 257171 + ... + 259103.

It is an arithmetic number, because the mean of its divisors is an integer number (35183328).

Almost surely, 2^498978821 is an apocalyptic number.

It is an amenable number.

498978821 is a deficient number, since it is larger than the sum of its proper divisors (63954427).

498978821 is a wasteful number, since it uses less digits than its factorization.

498978821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2732.

The product of its digits is 2322432, while the sum is 56.

The square root of 498978821 is about 22337.8338475332. The cubic root of 498978821 is about 793.1598175038.

The spelling of 498978821 in words is "four hundred ninety-eight million, nine hundred seventy-eight thousand, eight hundred twenty-one".