998844421 has 4 divisors (see below), whose sum is σ = 1051415200.
Its totient is φ = 946273644.
The previous prime is 998844389. The next prime is 998844433. The reversal of 998844421 is 124448899.
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.
It is not a de Polignac number, because 998844421 - 25 = 998844389 is a prime.
It is the 31605-th Hogben number.
It is a Duffinian number.
It is a nialpdrome in base 10.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (998842421) by changing a digit.
It is a nontrivial repunit in base 31604.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26285361 + ... + 26285398.
It is an arithmetic number, because the mean of its divisors is an integer number (262853800).
Almost surely, 2998844421 is an apocalyptic number.
It is an amenable number.
998844421 is a deficient number, since it is larger than the sum of its proper divisors (52570779).
998844421 is a wasteful number, since it uses less digits than its factorization.
998844421 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 52570778.
The product of its digits is 663552, while the sum is 49.
The square root of 998844421 is about 31604.5000118654.
The cubic root of 998844421 is about 999.6146585310.
The spelling of 998844421 in words is "nine hundred ninety-eight million, eight hundred forty-four thousand, four hundred twenty-one".