798638821 has 16 divisors (see below), whose sum is σ = 872083584. Its totient is φ = 729203904.

The previous prime is 798638803. The next prime is 798638831. The reversal of 798638821 is 128836897.

It is a cyclic number.

It is not a de Polignac number, because 798638821 - 2⁷ = 798638693 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 (798638831) 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, 36250 + ... + 53956.

It is an arithmetic number, because the mean of its divisors is an integer number (54505224).

Almost surely, 2^798638821 is an apocalyptic number.

It is an amenable number.

798638821 is a deficient number, since it is larger than the sum of its proper divisors (73444763).

798638821 is a wasteful number, since it uses less digits than its factorization.

798638821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17820.

The product of its digits is 1161216, while the sum is 52.

The square root of 798638821 is about 28260.1985307959. The cubic root of 798638821 is about 927.7909650592.

The spelling of 798638821 in words is "seven hundred ninety-eight million, six hundred thirty-eight thousand, eight hundred twenty-one".