998690 has 32 divisors (see below), whose sum is σ = 2242944. Its totient is φ = 311040.

The previous prime is 998689. The next prime is 998717. The reversal of 998690 is 96899.

It is a super-2 number, since 2×998690² = 1994763432200, which contains 22 as substring.

It is a zygodrome in base 6.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 122 + ... + 1418.

It is an arithmetic number, because the mean of its divisors is an integer number (70092).

2⁹⁹⁸⁶⁹⁰ is an apocalyptic number.

998690 is an abundant number, since it is smaller than the sum of its proper divisors (1244254).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

998690 is a wasteful number, since it uses less digits than its factorization.

998690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1322.

The product of its (nonzero) digits is 34992, while the sum is 41.

The square root of 998690 is about 999.3447853469. The cubic root of 998690 is about 99.9563142517.

The spelling of 998690 in words is "nine hundred ninety-eight thousand, six hundred ninety".