998426 has 16 divisors (see below), whose sum is σ = 1759968. Its totient is φ = 418800.

The previous prime is 998423. The next prime is 998429. The reversal of 998426 is 624899.

It is an interprime number because it is at equal distance from previous prime (998423) and next prime (998429).

It is a self number, because there is not a number n which added to its sum of digits gives 998426.

It is not an unprimeable number, because it can be changed into a prime (998423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1460 + ... + 2031.

It is an arithmetic number, because the mean of its divisors is an integer number (109998).

2⁹⁹⁸⁴²⁶ is an apocalyptic number.

998426 is a deficient number, since it is larger than the sum of its proper divisors (761542).

998426 is a wasteful number, since it uses less digits than its factorization.

998426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3517.

The product of its digits is 31104, while the sum is 38.

The square root of 998426 is about 999.2126900715. The cubic root of 998426 is about 99.9475057817.

The spelling of 998426 in words is "nine hundred ninety-eight thousand, four hundred twenty-six".