998841 has 4 divisors (see below), whose sum is σ = 1331792. Its totient is φ = 665892.

The previous prime is 998839. The next prime is 998843. The reversal of 998841 is 148899.

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: 148899 = 3 ⋅49633.

It is an interprime number because it is at equal distance from previous prime (998839) and next prime (998843).

It is not a de Polignac number, because 998841 - 2¹ = 998839 is a prime.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

It is a nialpdrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 998841.

It is not an unprimeable number, because it can be changed into a prime (998843) 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, 166471 + ... + 166476.

It is an arithmetic number, because the mean of its divisors is an integer number (332948).

2⁹⁹⁸⁸⁴¹ is an apocalyptic number.

It is an amenable number.

998841 is a deficient number, since it is larger than the sum of its proper divisors (332951).

998841 is a wasteful number, since it uses less digits than its factorization.

998841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332950.

The product of its digits is 20736, while the sum is 39.

The square root of 998841 is about 999.4203319925. The cubic root of 998841 is about 99.9613517317.

The spelling of 998841 in words is "nine hundred ninety-eight thousand, eight hundred forty-one".