999898 has 8 divisors (see below), whose sum is σ = 1528308. Its totient is φ = 490464.

The previous prime is 999883. The next prime is 999907. The reversal of 999898 is 898999.

It can be written as a sum of positive squares in 2 ways, for example, as 954529 + 45369 = 977^2 + 213^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

999898 is an untouchable number, because it is not equal to the sum of proper divisors of any 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 3 ways as a sum of consecutive naturals, for example, 4611 + ... + 4822.

2⁹⁹⁹⁸⁹⁸ is an apocalyptic number.

999898 is a deficient number, since it is larger than the sum of its proper divisors (528410).

999898 is a wasteful number, since it uses less digits than its factorization.

999898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9488.

The product of its digits is 419904, while the sum is 52.

The square root of 999898 is about 999.9489986994. The cubic root of 999898 is about 99.9965998844.

The spelling of 999898 in words is "nine hundred ninety-nine thousand, eight hundred ninety-eight".