998843861 has 4 divisors (see below), whose sum is σ = 1022072832.
Its totient is φ = 975614892.
The previous prime is 998843831. The next prime is 998843869. The reversal of 998843861 is 168348899.
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: 168348899 = 409 ⋅411611.
It is a cyclic number.
It is not a de Polignac number, because 998843861 - 214 = 998827477 is a prime.
It is a pancake number, because a pancake can be divided into 998843861 parts by 44695 straight cuts.
It is a Duffinian number.
It is a junction number, because it is equal to n+sod(n) for n = 998843797 and 998843806.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (998843869) 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, 11614421 + ... + 11614506.
It is an arithmetic number, because the mean of its divisors is an integer number (255518208).
Almost surely, 2998843861 is an apocalyptic number.
It is an amenable number.
998843861 is a deficient number, since it is larger than the sum of its proper divisors (23228971).
998843861 is a wasteful number, since it uses less digits than its factorization.
998843861 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 23228970.
The product of its digits is 2985984, while the sum is 56.
The square root of 998843861 is about 31604.4911523663.
The cubic root of 998843861 is about 999.6144717204.
The spelling of 998843861 in words is "nine hundred ninety-eight million, eight hundred forty-three thousand, eight hundred sixty-one".