998818 has 16 divisors (see below), whose sum is σ = 1642680. Its totient is φ = 453376.

The previous prime is 998813. The next prime is 998819. The reversal of 998818 is 818899.

It can be written as a sum of positive squares in 4 ways, for example, as 677329 + 321489 = 823^2 + 567^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (998813) by changing a digit.

998818 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 480 + ... + 1492.

2⁹⁹⁸⁸¹⁸ is an apocalyptic number.

998818 is a deficient number, since it is larger than the sum of its proper divisors (643862).

998818 is a wasteful number, since it uses less digits than its factorization.

998818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1061.

The product of its digits is 41472, while the sum is 43.

The square root of 998818 is about 999.4088252562. The cubic root of 998818 is about 99.9605844662.

The spelling of 998818 in words is "nine hundred ninety-eight thousand, eight hundred eighteen".