798821 has 4 divisors (see below), whose sum is σ = 810144. Its totient is φ = 787500.

The previous prime is 798799. The next prime is 798823. The reversal of 798821 is 128897.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 128897 = 157 ⋅821.

It is a cyclic number.

It is not a de Polignac number, because 798821 - 2⁶ = 798757 is a prime.

It is a super-2 number, since 2×798821² = 1276229980082, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (798823) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5555 + ... + 5696.

It is an arithmetic number, because the mean of its divisors is an integer number (202536).

2⁷⁹⁸⁸²¹ is an apocalyptic number.

798821 is a gapful number since it is divisible by the number (71) formed by its first and last digit.

It is an amenable number.

798821 is a deficient number, since it is larger than the sum of its proper divisors (11323).

798821 is a wasteful number, since it uses less digits than its factorization.

798821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11322.

The product of its digits is 8064, while the sum is 35.

The square root of 798821 is about 893.7678669543. The cubic root of 798821 is about 92.7861506408.

The spelling of 798821 in words is "seven hundred ninety-eight thousand, eight hundred twenty-one".