798646021 has 4 divisors (see below), whose sum is σ = 804475692. Its totient is φ = 792816352.

The previous prime is 798646001. The next prime is 798646027. The reversal of 798646021 is 120646897.

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 548215396 + 250430625 = 23414^2 + 15825^2 .

It is a cyclic number.

It is not a de Polignac number, because 798646021 - 2⁵ = 798645989 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 (798646027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2914630 + ... + 2914903.

It is an arithmetic number, because the mean of its divisors is an integer number (201118923).

Almost surely, 2^798646021 is an apocalyptic number.

It is an amenable number.

798646021 is a deficient number, since it is larger than the sum of its proper divisors (5829671).

798646021 is a wasteful number, since it uses less digits than its factorization.

798646021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5829670.

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 798646021 is about 28260.3259181489. The cubic root of 798646021 is about 927.7937531676.

The spelling of 798646021 in words is "seven hundred ninety-eight million, six hundred forty-six thousand, twenty-one".