998824857 has 4 divisors (see below), whose sum is σ = 1331766480. Its totient is φ = 665883236.

The previous prime is 998824843. The next prime is 998824859. The reversal of 998824857 is 758428899.

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: 758428899 = 3 ⋅252809633.

It is a cyclic number.

It is not a de Polignac number, because 998824857 - 2⁶ = 998824793 is a prime.

It is a super-2 number, since 2×998824857² = 1995302189922140898, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 998824857.

It is not an unprimeable number, because it can be changed into a prime (998824859) 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, 166470807 + ... + 166470812.

It is an arithmetic number, because the mean of its divisors is an integer number (332941620).

Almost surely, 2^998824857 is an apocalyptic number.

It is an amenable number.

998824857 is a deficient number, since it is larger than the sum of its proper divisors (332941623).

998824857 is a wasteful number, since it uses less digits than its factorization.

998824857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332941622.

The product of its digits is 11612160, while the sum is 60.

The square root of 998824857 is about 31604.1904974641. The cubic root of 998824857 is about 999.6081321263.

The spelling of 998824857 in words is "nine hundred ninety-eight million, eight hundred twenty-four thousand, eight hundred fifty-seven".